[
  {
    "name": "Aluminum",
    "color": [0.933, 0.912, 0.853],
    "metalness": 1,
    "specularColor": [0.981, 0.979, 0.961],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [1.16234, 7.90265, 0.958053, 6.29309, 1.04947, 5.01364],
    "density": 2700,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=aluminium",
      "https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_standard_surface_ac_standard_base_html#metalness",
      "https://en.wikipedia.org/wiki/Aluminium",
      "https://en.wikipedia.org/wiki/Density",
      "https://en.wikipedia.org/wiki/Mirror"
    ],
    "tags": ["aluminium", "mirror"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/aluminum.jpeg"
    ]
  },
  {
    "name": "Banana",
    "color": [0.634, 0.532, 0.111],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 0,
    "category": ["Organic"],
    "description": "",
    "sources": ["https://spectraldb.com/measurements/00379/"],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/banana.jpeg"
    ]
  },
  {
    "name": "Blackboard",
    "color": [0.039, 0.039, 0.039],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 0,
    "category": ["Manmade"],
    "description": "",
    "sources": [
      "https://spectraldb.com/measurements/00079/",
      "https://github.com/AntonPalmqvist/physically-based-api/tree/main/data/materials/blackboard/"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/blackboard.jpeg"
    ]
  },
  {
    "name": "Blood",
    "color": [0.64448, 0.003, 0.005],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.301,
    "transmission": 1,
    "density": 1060,
    "viscosity": 2.8,
    "category": ["Human"],
    "description": "The color of blood depends on its oxygen level. When there is plenty of oxygen, the color is a brighter red. The reason is because of a protein called hemoglobin, which carries the oxygen in your blood. When hemoglobin has a full oxygen load, it has a bright red color, and when it's deoxygenated it's a darker red. For example, arterial and capillary blood is bright, and venous blood is dark.",
    "sources": [
      "https://en.wikipedia.org/wiki/Blood",
      "https://en.wikipedia.org/wiki/Blood_red",
      "https://refractiveindex.info/?shelf=other&book=blood&page=Rowe",
      "https://hypertextbook.com/facts/2004/MichaelShmukler.shtml",
      "https://www.researchgate.net/figure/Color-chart-for-the-measurement-of-methemoglobin-The-color-chart-was-prepared-according_fig2_26884296",
      "https://www.engineeringtoolbox.com/absolute-viscosity-liquids-d_1259.html",
      "https://en.wikipedia.org/wiki/Hemorheology",
      "https://www.frontiersin.org/articles/10.3389/fphys.2019.01329/full",
      "https://nextlimitsupport.atlassian.net/wiki/spaces/rf2016docs/pages/5497120/Hybrido+Viscosity+Table",
      "https://wiki.anton-paar.com/en/whole-blood/"
    ],
    "tags": ["liquid"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/blood.jpeg"
    ]
  },
  {
    "name": "Bone",
    "color": [0.793, 0.793, 0.664],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 1900,
    "densityRange": [1000, 2000],
    "category": ["Organic"],
    "description": "",
    "sources": [
      "https://hypertextbook.com/facts/2002/AnnaYarusskaya.shtml",
      "https://www.tandfonline.com/doi/pdf/10.3109/02841867809127938",
      "https://en.wikipedia.org/wiki/Bone"
    ],
    "tags": ["skeleton"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/bone.jpeg"
    ]
  },
  {
    "name": "Brass",
    "color": [0.931, 0.776, 0.392],
    "metalness": 1,
    "specularColor": [0.995, 0.974, 0.747],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [0.341048, 4.14088, 0.53349, 2.67993, 1.42749, 1.87543],
    "density": 8600,
    "category": ["Metal"],
    "description": "Brass is an alloy of copper and zinc, with a bright and gold-like appearance. It is similar to bronze, another alloy containing copper that uses tin instead of zinc. Historically, the distinction between the two alloys has been less consistent and clear, and modern practice in museums and archaeology increasingly avoids both terms for historical objects in favor of the more general \"copper alloy\".",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=brass",
      "https://en.wikipedia.org/wiki/Brass",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/brass.jpeg"
    ]
  },
  {
    "name": "Brick",
    "color": [0.262, 0.095, 0.061],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 2000,
    "densityRange": [500, 2400],
    "acousticAbsorption": [0.03, 0.03, 0.03, 0.04, 0.05, 0.07],
    "category": ["Manmade"],
    "description": "",
    "sources": [
      "https://github.com/AntonPalmqvist/physically-based-api/tree/main/data/materials/brick/",
      "https://en.wikipedia.org/wiki/Brick",
      "https://www.acoustic-supplies.com/absorption-coefficient-chart/",
      "https://en.wikipedia.org/wiki/Absorption_(acoustics)",
      "https://www.acoustic.ua/st/web_absorption_data_eng.pdf"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/brick.jpeg"
    ]
  },
  {
    "name": "Car Paint",
    "color": [0.1, 0.1, 0.1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.5,
    "density": 0,
    "category": ["Manmade"],
    "description": "Modern car paints are nearly always an acrylic polyurethane \"enamel\" with a pigmented basecoat and a clear topcoat. It may be described as \"acrylic\", \"acrylic enamel\", \"urethane\", etc. and the clearcoat in particular may be described as a lacquer. The size of the metal flakes in metallic paints is typically between 100 to 400 microns in diameter. Modern automobile paint is applied in several layers, with a total thickness of around 100 μm (0.1mm).",
    "sources": [
      "https://en.wikipedia.org/wiki/Automotive_paint",
      "https://en.wikipedia.org/wiki/Lacquer#Acrylic_lacquers",
      "https://hal.science/hal-04030017/document",
      "https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2011163461",
      "https://thecandeshop.com/metal-flake-for-cars/",
      "https://www.theultimatefinish.co.uk/car-care-blog/featured/paintwork/"
    ],
    "tags": ["acrylic", "coat", "car paint", "lacquer", "metallic"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/car-paint.jpeg"
    ]
  },
  {
    "name": "Carrot",
    "color": [0.713, 0.17, 0.026],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 0,
    "category": ["Organic"],
    "description": "",
    "sources": ["https://spectraldb.com/measurements/00456/"],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/carrot.jpeg"
    ]
  },
  {
    "name": "Charcoal",
    "color": [0.02, 0.02, 0.02],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 300,
    "densityRange": [200, 500],
    "category": ["Organic"],
    "description": "",
    "sources": [
      "https://chrisbrejon.com/articles/albedo-and-pointers-gamut/",
      "https://seblagarde.wordpress.com/2011/08/17/feeding-a-physical-based-lighting-mode/",
      "http://ukrfuel.com/news-physical-properties-of-charcoal-22.html",
      "https://en.wikipedia.org/wiki/Activated_carbon"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/charcoal.jpeg"
    ]
  },
  {
    "name": "Chocolate",
    "color": [0.162, 0.091, 0.06],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 1300,
    "densityRange": [1229, 1336],
    "category": ["Organic"],
    "description": "",
    "sources": [
      "https://github.com/AntonPalmqvist/physically-based-api/tree/main/data/materials/chocolate/",
      "https://en.wikipedia.org/wiki/Chocolate_(color)",
      "https://www.density.co.uk/documents/Density-of-Chocolate.pdf"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/chocolate.jpeg"
    ]
  },
  {
    "name": "Chromium",
    "color": [0.653, 0.65, 0.615],
    "metalness": 1,
    "specularColor": [0.675, 0.72, 0.711],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [3.20617, 4.38724, 2.76851, 4.18069, 2.56326, 3.75018],
    "density": 7200,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=main&book=Cr&page=Rakic-BB",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["chrome"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/chromium.jpeg"
    ]
  },
  {
    "name": "Cobalt",
    "color": [0.715, 0.702, 0.622],
    "metalness": 1,
    "specularColor": [0.731, 0.775, 0.715],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [3.33754, 5.27723, 2.6841, 4.73548, 2.57555, 3.81892],
    "density": 8900,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=main&book=Co&page=Werner-DFT",
      "https://seblagarde.wordpress.com/2011/08/17/feeding-a-physical-based-lighting-mode/",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/cobalt.jpeg"
    ]
  },
  {
    "name": "Coffee",
    "color": [0.027, 0.019, 0.018],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.33,
    "subsurfaceRadius": [10, 5, 1],
    "density": 1000,
    "viscosity": 1.002,
    "category": ["Liquid"],
    "description": "",
    "sources": [
      "https://github.com/AntonPalmqvist/physically-based-api/tree/main/data/materials/coffee/"
    ],
    "tags": ["sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/coffee.jpeg"
    ]
  },
  {
    "name": "Concrete",
    "color": [0.51, 0.51, 0.51],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 2400,
    "acousticAbsorption": [0.01, 0.01, 0.02, 0.02, 0.02, 0.02],
    "category": ["Manmade"],
    "description": "",
    "sources": [
      "https://seblagarde.wordpress.com/2011/08/17/feeding-a-physical-based-lighting-mode/",
      "https://en.wikipedia.org/wiki/Density",
      "https://en.wikipedia.org/wiki/Absorption_(acoustics)",
      "https://www.acoustic-supplies.com/absorption-coefficient-chart/",
      "https://www.acoustic.ua/st/web_absorption_data_eng.pdf"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/concrete.jpeg"
    ]
  },
  {
    "name": "Cooking Oil",
    "color": [0.737911, 0.687, 0.091],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.47,
    "transmission": 1,
    "density": 920,
    "viscosity": 46,
    "category": ["Liquid"],
    "description": "",
    "sources": [
      "https://hypertextbook.com/facts/2006/TingTingLuo.shtml",
      "https://en.wikipedia.org/wiki/List_of_refractive_indices",
      "https://www.color-name.com/olive-oil.color",
      "https://en.wikipedia.org/wiki/Density",
      "https://en.wikipedia.org/wiki/List_of_viscosities",
      "https://downloads.hindawi.com/archive/2014/234583.pdf",
      "https://nextlimitsupport.atlassian.net/wiki/spaces/rf2016docs/pages/5497120/Hybrido+Viscosity+Table"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/cooking-oil.jpeg"
    ]
  },
  {
    "name": "Copper",
    "color": [0.988, 0.688, 0.448],
    "metalness": 1,
    "specularColor": [0.999, 0.946, 0.705],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [0.137212, 5.48257, 0.750114, 2.56138, 1.75582, 2.26828],
    "density": 8940,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=copper",
      "https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_standard_surface_ac_standard_base_html#metalness",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/copper.jpeg"
    ]
  },
  {
    "name": "Diamond",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 2.4168,
    "transmission": 1,
    "transmissionDispersion": 55.3,
    "density": 3500,
    "category": ["Crystal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=crystals&page=diamond",
      "https://refractiveindex.info/?shelf=main&book=C&page=Peter",
      "https://www.gemsociety.org/article/table-refractive-index-double-refraction-gems/",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["gem", "gemstone"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/diamond.jpeg"
    ]
  },
  {
    "name": "Egg Shell",
    "color": [0.61, 0.624, 0.631],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 0,
    "category": ["Organic"],
    "description": "White hen egg from grocery store.",
    "sources": [
      "https://github.com/AntonPalmqvist/physically-based-api/tree/main/data/materials/egg-shell/",
      "https://en.wikipedia.org/wiki/Egg_as_food#Shell"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/egg-shell.jpeg"
    ]
  },
  {
    "name": "Eye (cornea)",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.376,
    "transmission": 1,
    "density": 0,
    "category": ["Human"],
    "description": "",
    "sources": [
      "https://en.wikipedia.org/wiki/Cornea",
      "https://www.sciencedirect.com/science/article/abs/pii/S1367048418310452"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/eye-cornea.jpeg"
    ]
  },
  {
    "name": "Eye (lens)",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.386,
    "transmission": 1,
    "density": 0,
    "category": ["Human"],
    "description": "The refractive index of human lens varies from approximately 1.406 in the central layers down to 1.386 in less dense layers of the lens. This index gradient enhances the optical power of the lens.",
    "sources": [
      "https://en.wikipedia.org/wiki/Lens_(anatomy)#Accommodation",
      "https://pubmed.ncbi.nlm.nih.gov/8134087/"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/eye-lens.jpeg"
    ]
  },
  {
    "name": "Eye (sclera)",
    "color": [0.68, 0.49, 0.37],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.4,
    "density": 0,
    "category": ["Human"],
    "description": "",
    "sources": [
      "https://www.researchgate.net/publication/225767258_Optical_properties_of_human_sclera_in_spectral_range_370-2500_nm",
      "http://www.iryoku.com/downloads/Next-Generation-Character-Rendering-v6.pptx"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/eye-sclera.jpeg"
    ]
  },
  {
    "name": "Gasoline",
    "color": [1, 0.97, 0.617],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.427,
    "transmission": 1,
    "density": 770,
    "viscosity": 0.6,
    "category": ["Liquid"],
    "description": "",
    "sources": [
      "https://en.wikipedia.org/wiki/Gasoline",
      "https://www.researchgate.net/figure/Refractive-index-of-fuels-33-34_tbl1_277419833",
      "https://www.engineeringtoolbox.com/fuels-densities-specific-volumes-d_166.html",
      "http://hyperphysics.phy-astr.gsu.edu/hbase/Tables/viscosity.html"
    ],
    "tags": ["petrol", "fuel"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/gasoline.jpeg"
    ]
  },
  {
    "name": "Glass",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.52,
    "transmission": 1,
    "transmissionDispersion": 64,
    "density": 2500,
    "acousticAbsorption": [0.04, 0.04, 0.03, 0.03, 0.02, 0.02],
    "category": ["Crystal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=glass&page=soda-lime-clear",
      "https://en.wikipedia.org/wiki/Soda%E2%80%93lime_glass",
      "https://en.wikipedia.org/wiki/Density",
      "https://www.acoustic-supplies.com/absorption-coefficient-chart/",
      "https://www.acoustic.ua/st/web_absorption_data_eng.pdf"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/glass.jpeg"
    ]
  },
  {
    "name": "Gold",
    "color": [1.0, 0.72, 0.315],
    "metalness": 1,
    "specularColor": [1.0, 0.973, 0.597],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [0, 6.3108, 0.487424, 2.18391, 1.74577, 1.63493],
    "density": 19320,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=gold",
      "https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_standard_surface_ac_standard_base_html#metalness",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/gold.jpeg"
    ]
  },
  {
    "name": "Gray Card",
    "color": [0.18, 0.18, 0.18],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 0,
    "category": ["Manmade"],
    "description": "In photography and computer graphics, middle gray is a tone that is perceptually about halfway between black and white on a lightness scale. Light meters and cameras are often calibrated using an 18% gray card or a color reference card such as a ColorChecker. It is typically defined as 18% reflectance in visible light.",
    "sources": ["https://en.wikipedia.org/wiki/Middle_gray"],
    "tags": ["grey", "middle gray"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/gray-card.jpeg"
    ]
  },
  {
    "name": "Honey",
    "color": [0.83077, 0.397, 0.038],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.504,
    "transmission": 1,
    "density": 1400,
    "densityRange": [1380, 1450],
    "viscosity": 10000,
    "category": ["Liquid"],
    "description": "Variations in its water content alter its refractive index. Typically, the refractive index for honey ranges from 1.504 at 13% water content to 1.474 at 25%.",
    "sources": [
      "https://www.color-name.com/honey.color",
      "https://en.wikipedia.org/wiki/Honey",
      "https://carolinahoneybees.com/the-color-of-honey/",
      "https://books.google.se/books?id=6RfVqdqxCiUC&pg=PA74&redir_esc=y#v=onepage&q&f=false",
      "https://wiki.anton-paar.com/en/flower-honey-blended/",
      "https://nextlimitsupport.atlassian.net/wiki/spaces/rf2016docs/pages/5497120/Hybrido+Viscosity+Table",
      "https://en.wikipedia.org/wiki/List_of_viscosities",
      "https://www.engineeringtoolbox.com/dynamic-absolute-kinematic-viscosity-d_412.html"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/honey.jpeg"
    ]
  },
  {
    "name": "Ice",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.3098,
    "transmission": 1,
    "transmissionDispersion": 64.87,
    "density": 917,
    "category": ["Crystal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=crystals&page=ice",
      "https://refractiveindex.info/?shelf=main&book=H2O&page=Kofman-150K",
      "https://en.wikipedia.org/wiki/Density",
      "https://en.wikipedia.org/wiki/Optical_properties_of_water_and_ice"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/ice.jpeg"
    ]
  },
  {
    "name": "Iron",
    "color": [0.542, 0.512, 0.458],
    "metalness": 1,
    "specularColor": [0.612, 0.541, 0.422],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [2.73466, 3.14869, 2.94186, 2.92718, 3.15654, 2.46012],
    "density": 7870,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=iron",
      "https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_standard_surface_ac_standard_base_html#metalness",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/iron.jpeg"
    ]
  },
  {
    "name": "Ketchup",
    "color": [0.164, 0.006, 0.002],
    "metalness": 0,
    "roughness": 0.1,
    "ior": 1.3,
    "subsurfaceRadius": [0.476, 0.058, 0.039],
    "density": 1150,
    "viscosity": 20000,
    "category": ["Organic"],
    "description": "",
    "sources": [
      "https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_standard_surface_ac_standard_subsurface_html",
      "https://graphics.stanford.edu/papers/bssrdf/bssrdf.pdf",
      "https://renderman.pixar.com/resources/RenderMan_20/subsurface.html",
      "https://nextlimitsupport.atlassian.net/wiki/spaces/rf2016docs/pages/5497120/Hybrido+Viscosity+Table",
      "https://en.wikipedia.org/wiki/List_of_viscosities",
      "https://www.aqua-calc.com/page/density-table/substance/heinz-blank-tomato-blank-ketchup-coma-and-blank-upc-column--blank-00013000004664"
    ],
    "tags": ["liquid", "sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/ketchup.jpeg"
    ]
  },
  {
    "name": "Lead",
    "color": [0.641, 0.622, 0.59],
    "metalness": 1,
    "specularColor": [0.819, 0.804, 0.769],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [1.81659, 3.50606, 1.84441, 3.37971, 1.96022, 3.23189],
    "density": 11340,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=lead",
      "https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_standard_surface_ac_standard_base_html#metalness",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/lead.jpeg"
    ]
  },
  {
    "name": "Lemon",
    "color": [0.718, 0.483, 0],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 0,
    "category": ["Organic"],
    "description": "",
    "sources": ["https://spectraldb.com/measurements/00453/"],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/lemon.jpeg"
    ]
  },
  {
    "name": "Marble",
    "color": [0.83, 0.791, 0.753],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.5,
    "subsurfaceRadius": [0.851, 0.557, 0.395],
    "density": 2700,
    "category": ["Crystal"],
    "description": "",
    "sources": [
      "https://en.wikipedia.org/wiki/Marble",
      "https://www.aqua-calc.com/page/density-table/substance/marble",
      "https://www.sciencedirect.com/science/article/pii/S2090447919300826",
      "https://graphics.stanford.edu/papers/bssrdf/bssrdf.pdf",
      "https://renderman.pixar.com/resources/RenderMan_20/subsurface.html"
    ],
    "tags": ["sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/marble.jpeg"
    ]
  },
  {
    "name": "Mercury",
    "color": [0.799, 0.777, 0.721],
    "metalness": 1,
    "specularColor": [0.901, 0.91, 0.89],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [1.86932, 5.36989, 1.53811, 4.60484, 1.4963, 3.92685],
    "density": 13546,
    "viscosity": 1.552,
    "category": ["Metal"],
    "description": "Mercury is the only metallic element that is known to be liquid at standard conditions.",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=mercury",
      "https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_standard_surface_ac_standard_base_html#metalness",
      "https://en.wikipedia.org/wiki/Density",
      "https://en.wikipedia.org/wiki/List_of_viscosities",
      "https://www.engineeringtoolbox.com/absolute-viscosity-liquids-d_1259.html"
    ],
    "tags": ["liquid"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/mercury.jpeg"
    ]
  },
  {
    "name": "Milk",
    "color": [0.815, 0.813, 0.682],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.348,
    "subsurfaceRadius": [1.842, 1.044, 0.35],
    "density": 1030,
    "densityRange": [1026, 1035],
    "viscosity": 2,
    "category": ["Liquid"],
    "description": "Cow's milk",
    "sources": [
      "https://renderman.pixar.com/resources/RenderMan_20/subsurface.html",
      "https://www.researchgate.net/publication/346758555_What_Is_the_Color_of_Milk_and_Dairy_Products_and_How_Is_It_Measured",
      "http://dairy-technology.blogspot.com/2014/11/refractive-index.html",
      "https://www.theengineer.co.uk/content/product/density-measurement-of-milk-and-dairy-products/",
      "https://hypertextbook.com/facts/2002/AliciaNoelleJones.shtml",
      "https://nextlimitsupport.atlassian.net/wiki/spaces/rf2016docs/pages/5497120/Hybrido+Viscosity+Table",
      "https://en.wikipedia.org/wiki/List_of_viscosities",
      "https://www.engineeringtoolbox.com/absolute-viscosity-liquids-d_1259.html"
    ],
    "tags": ["sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/milk.jpeg"
    ]
  },
  {
    "name": "MIT Black",
    "color": [0.00005, 0.00005, 0.00005],
    "metalness": 0,
    "roughness": 0.99,
    "ior": 1.5,
    "density": 0,
    "category": ["Manmade"],
    "description": "",
    "sources": ["https://news.mit.edu/2019/blackest-black-material-cnt-0913"],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/mit-black.jpeg"
    ]
  },
  {
    "name": "Musou Black",
    "color": [0.006, 0.006, 0.006],
    "metalness": 0,
    "roughness": 0.9,
    "ior": 1.5,
    "density": 0,
    "category": ["Manmade"],
    "description": "Musou Black is one of the darkest paints available. Darker materials can be achieved by using technology such as carbon nanotubes, like the MIT Black material.",
    "sources": [
      "https://www.musoublack.com/pages/product-specifications",
      "https://github.com/AntonPalmqvist/physically-based-api/tree/main/data/materials/musou-black/"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/musou-black.jpeg"
    ]
  },
  {
    "name": "Nickel",
    "color": [0.664, 0.606, 0.495],
    "metalness": 1,
    "specularColor": [0.824, 0.798, 0.68],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [1.88896, 3.7543, 1.81884, 3.2447, 2.0708, 2.64853],
    "density": 8900,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=main&book=Ni&page=Rakic-BB",
      "https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_standard_surface_ac_standard_base_html#metalness",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/nickel.jpeg"
    ]
  },
  {
    "name": "Office Paper",
    "color": [0.794, 0.834, 0.884],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 800,
    "category": ["Manmade"],
    "description": "Office paper contains optical brightening additives that absorb light in the ultraviolet and violet region (usually 340-370 nm), and re-emit light in the blue region (typically 420-470 nm) by fluorescence.",
    "sources": [
      "https://github.com/AntonPalmqvist/physically-based-api/tree/main/data/materials/office-paper",
      "https://en.wikipedia.org/wiki/Paper#Types,_thickness_and_weight",
      "https://en.wikipedia.org/wiki/Optical_brightener"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/office-paper.jpeg"
    ]
  },
  {
    "name": "Pearl",
    "color": [0.8, 0.75, 0.7],
    "metalness": 0,
    "roughness": 0.35,
    "ior": 1.68,
    "subsurfaceRadius": [0.3, 0.5, 0.3],
    "thinFilmThickness": 420,
    "thinFilmIor": 2,
    "density": 2700,
    "category": ["Organic"],
    "description": "The akoya pearl is a saltwater cultured pearl from the akoya oyster. Akoya are considered to be the classic pearl used for necklaces and other pearl jewelry. Nacre is the material of which pearls are composed and consists of aragonite crystal layers separated by conchiolin, a protein secreted by mollusk shells. The thickness of these layers determines the color of reflection from the nacre. The transmission interference color is complementary to the reflection interference color.",
    "sources": [
      "https://www.nature.com/articles/s41598-021-94737-w",
      "https://rgl.s3.eu-central-1.amazonaws.com/media/papers/Guillen2020Pearlescent.pdf",
      "https://www.gemstones-guide.com/Pearl.html",
      "https://www.gemsociety.org/article/pearl-jewelry-and-gemstone-information/",
      "https://refractiveindex.info/?shelf=main&book=CaCO3&page=Ghosh-o",
      "https://en.wikipedia.org/wiki/Nacre"
    ],
    "tags": ["nacre", "sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/pearl.jpeg"
    ]
  },
  {
    "name": "Petroleum",
    "color": [0.03, 0.027, 0.024],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.5,
    "subsurfaceRadius": [3, 1, 0.25],
    "density": 920,
    "densityRange": [870, 1000],
    "viscosity": 100,
    "category": ["Liquid"],
    "description": "The viscosity of crude oil is sensitive to temperature.",
    "sources": [
      "https://en.wikipedia.org/wiki/Petroleum",
      "https://en.wikipedia.org/wiki/API_gravity",
      "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9922782/",
      "https://www.sciencedirect.com/science/article/abs/pii/S1350449520305636",
      "https://www.sciencedirect.com/science/article/pii/S003442572200133X"
    ],
    "tags": ["oil", "crude oil", "sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/petroleum.jpeg"
    ]
  },
  {
    "name": "Plastic (Acrylic)",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.4905,
    "transmission": 1,
    "transmissionDispersion": 53.18,
    "density": 1180,
    "category": ["Plastic"],
    "description": "",
    "sources": [
      "https://en.wikipedia.org/wiki/Poly(methyl_methacrylate)",
      "https://polymerdatabase.com/polymer%20physics/Ref%20Index%20Table2%20.html"
    ],
    "tags": ["PMMA", "plexi", "polymethyl methacrylate"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/plastic-acrylic.jpeg"
    ]
  },
  {
    "name": "Plastic (PC)",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.5848,
    "transmission": 1,
    "transmissionDispersion": 27.86,
    "density": 1200,
    "category": ["Plastic"],
    "description": "",
    "sources": [
      "https://en.wikipedia.org/wiki/Polycarbonate",
      "https://refractiveindex.info/?shelf=3d&book=plastics&page=pc",
      "https://www.bpf.co.uk/plastipedia/polymers/polycarbonate.aspx"
    ],
    "tags": ["polycarbonate"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/plastic-pc.jpeg"
    ]
  },
  {
    "name": "Plastic (PET)",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.575,
    "transmission": 1,
    "density": 1380,
    "category": ["Plastic"],
    "description": "",
    "sources": [
      "https://en.wikipedia.org/wiki/Polyethylene_terephthalate",
      "https://polymerdatabase.com/polymer%20physics/Ref%20Index%20Table2%20.html"
    ],
    "tags": ["polyethylene terephthalate"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/plastic-pet.jpeg"
    ]
  },
  {
    "name": "Plastic (PP)",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.492,
    "transmission": 1,
    "density": 900,
    "category": ["Plastic"],
    "description": "",
    "sources": [
      "https://en.wikipedia.org/wiki/Polypropylene",
      "https://refractiveindex.info/?shelf=3d&book=plastics&page=pc",
      "https://www.osapublishing.org/ao/viewmedia.cfm?uri=ao-42-3-592"
    ],
    "tags": ["polypropylene"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/plastic-pp.jpeg"
    ]
  },
  {
    "name": "Plastic (PVC)",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.542,
    "transmission": 1,
    "density": 1300,
    "densityRange": [1100, 1450],
    "category": ["Plastic"],
    "description": "",
    "sources": [
      "https://en.wikipedia.org/wiki/Polyvinyl_chloride",
      "https://polymerdatabase.com/polymer%20physics/Ref%20Index%20Table2%20.html"
    ],
    "tags": ["polyvinyl chloride"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/plastic-pvc.jpeg"
    ]
  },
  {
    "name": "Platinum",
    "color": [0.695, 0.638, 0.541],
    "metalness": 1,
    "specularColor": [0.816, 0.786, 0.671],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [2.1755, 4.28265, 2.0879, 3.67782, 2.35677, 3.05144],
    "density": 21450,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=platinum",
      "https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_standard_surface_ac_standard_base_html#metalness",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/platinum.jpeg"
    ]
  },
  {
    "name": "Polyurethane",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.6,
    "transmission": 1,
    "density": 0,
    "category": ["Plastic"],
    "description": "Modern car paints are nearly always an acrylic polyurethane \"enamel\" with a pigmented basecoat and a clear topcoat. It may be described as \"acrylic\", \"acrylic enamel\", \"urethane\", etc. and the clearcoat in particular may be described as a lacquer.",
    "sources": [
      "https://en.wikipedia.org/wiki/Automotive_paint",
      "https://en.wikipedia.org/wiki/Lacquer#Acrylic_lacquers",
      "https://hal.science/hal-04030017/document",
      "https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2011163461"
    ],
    "tags": ["acrylic", "coat", "car paint", "lacquer"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/polyurethane.jpeg"
    ]
  },
  {
    "name": "Quartz",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.54,
    "transmission": 1,
    "transmissionDispersion": 67.82,
    "density": 2600,
    "category": ["Crystal"],
    "description": "",
    "sources": [
      "https://en.wikipedia.org/w/index.php?title=Quartz&oldid=1274064692",
      "https://en.wikipedia.org/w/index.php?title=Density&oldid=1271894167",
      "https://refractiveindex.info/?shelf=3d&book=crystals&page=quartz"
    ],
    "tags": [],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/quartz.jpeg"
    ]
  },
  {
    "name": "Salt",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0.2,
    "ior": 1.5441,
    "transmission": 1,
    "transmissionDispersion": 42.89,
    "density": 2170,
    "category": ["Crystal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=crystals&page=salt",
      "https://en.wikipedia.org/wiki/Sodium_chloride"
    ],
    "tags": [],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/salt.jpeg"
    ]
  },
  {
    "name": "Sand",
    "color": [0.44, 0.386, 0.23074],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 1600,
    "category": ["Crystal"],
    "description": "",
    "sources": [
      "https://civiltoday.com/civil-engineering-materials/sand/299-bulk-density-of-sand",
      "https://seblagarde.wordpress.com/2014/04/14/dontnod-physically-based-rendering-chart-for-unreal-engine-4/",
      "https://en.wikipedia.org/wiki/Sand"
    ],
    "tags": [],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/sand.jpeg"
    ]
  },
  {
    "name": "Sapphire",
    "color": [0.67, 0.764, 0.855],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.7682,
    "transmission": 1,
    "transmissionDispersion": 72.2,
    "density": 3980,
    "category": ["Crystal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=crystals&page=sapphire",
      "https://www.gemsociety.org/article/table-refractive-index-double-refraction-gems/",
      "https://en.wikipedia.org/wiki/Sapphire",
      "http://www.roditi.com/SingleCrystal/Sapphire/Properties.html"
    ],
    "tags": ["gem", "gemstone"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/sapphire.jpeg"
    ]
  },
  {
    "name": "Silicon",
    "color": [0.351, 0.367, 0.394],
    "metalness": 1,
    "specularColor": [0.081, 0, 0.004],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [3.63351, 0.966245, 4.06958, 0, 4.36103, 0],
    "density": 2330,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=main&book=Si&page=Schinke",
      "https://en.wikipedia.org/wiki/Density",
      "https://en.wikipedia.org/wiki/Silicon"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/silicon.jpeg"
    ]
  },
  {
    "name": "Silver",
    "color": [0.984, 0.946, 0.851],
    "metalness": 1,
    "specularColor": [0.999, 0.998, 0.986],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [0.0636949, 3.69295, 0.155409, 3.20559, 0.426839, 3.12206],
    "density": 10500,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=silver",
      "https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_standard_surface_ac_standard_base_html#metalness",
      "https://en.wikipedia.org/wiki/Density",
      "https://en.wikipedia.org/wiki/Mirror"
    ],
    "tags": ["mirror"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/silver.jpeg"
    ]
  },
  {
    "name": "Skin I",
    "color": [0.847, 0.638, 0.552],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.4,
    "subsurfaceRadius": [0.482, 0.169, 0.109],
    "density": 1020,
    "category": ["Human"],
    "group": "Skin",
    "description": "",
    "sources": [
      "https://www.spiedigitallibrary.org/journals/journal-of-biomedical-optics/volume-17/issue-9/090901/Optical-properties-of-human-skin/10.1117/1.JBO.17.9.090901.full?SSO=1",
      "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3699319/",
      "http://graphics.ucsd.edu/~henrik/papers/skin_bssrdf/skin_bssrdf.pdf",
      "http://www.iryoku.com/downloads/Next-Generation-Character-Rendering-v6.pptx",
      "https://graphics.stanford.edu/papers/bssrdf/bssrdf.pdf",
      "https://renderman.pixar.com/resources/RenderMan_20/subsurface.html"
    ],
    "tags": ["epidermis", "sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/skin-i.jpeg"
    ]
  },
  {
    "name": "Skin II",
    "color": [0.799, 0.485, 0.347],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.4,
    "subsurfaceRadius": [0.482, 0.169, 0.109],
    "density": 1020,
    "category": ["Human"],
    "group": "Skin",
    "description": "",
    "sources": [
      "https://www.spiedigitallibrary.org/journals/journal-of-biomedical-optics/volume-17/issue-9/090901/Optical-properties-of-human-skin/10.1117/1.JBO.17.9.090901.full?SSO=1",
      "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3699319/",
      "http://graphics.ucsd.edu/~henrik/papers/skin_bssrdf/skin_bssrdf.pdf",
      "http://www.iryoku.com/downloads/Next-Generation-Character-Rendering-v6.pptx",
      "https://graphics.stanford.edu/papers/bssrdf/bssrdf.pdf",
      "https://renderman.pixar.com/resources/RenderMan_20/subsurface.html"
    ],
    "tags": ["epidermis", "sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/skin-ii.jpeg"
    ]
  },
  {
    "name": "Skin III",
    "color": [0.623, 0.433, 0.343],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.4,
    "subsurfaceRadius": [0.482, 0.169, 0.109],
    "density": 1020,
    "category": ["Human"],
    "group": "Skin",
    "description": "",
    "sources": [
      "https://www.spiedigitallibrary.org/journals/journal-of-biomedical-optics/volume-17/issue-9/090901/Optical-properties-of-human-skin/10.1117/1.JBO.17.9.090901.full?SSO=1",
      "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3699319/",
      "http://graphics.ucsd.edu/~henrik/papers/skin_bssrdf/skin_bssrdf.pdf",
      "http://www.iryoku.com/downloads/Next-Generation-Character-Rendering-v6.pptx",
      "https://graphics.stanford.edu/papers/bssrdf/bssrdf.pdf",
      "https://renderman.pixar.com/resources/RenderMan_20/subsurface.html",
      "https://spectraldb.com/measurements/00490/",
      "https://spectraldb.com/measurements/00403/"
    ],
    "tags": ["epidermis", "sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/skin-iii.jpeg"
    ]
  },
  {
    "name": "Skin IV",
    "color": [0.436, 0.227, 0.131],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.4,
    "subsurfaceRadius": [0.367, 0.137, 0.068],
    "density": 1020,
    "category": ["Human"],
    "group": "Skin",
    "description": "",
    "sources": [
      "https://www.spiedigitallibrary.org/journals/journal-of-biomedical-optics/volume-17/issue-9/090901/Optical-properties-of-human-skin/10.1117/1.JBO.17.9.090901.full?SSO=1",
      "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3699319/",
      "http://graphics.ucsd.edu/~henrik/papers/skin_bssrdf/skin_bssrdf.pdf",
      "http://www.iryoku.com/downloads/Next-Generation-Character-Rendering-v6.pptx",
      "https://graphics.stanford.edu/papers/bssrdf/bssrdf.pdf",
      "https://renderman.pixar.com/resources/RenderMan_20/subsurface.html",
      "https://spectraldb.com/measurements/00408/"
    ],
    "tags": ["epidermis", "sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/skin-iv.jpeg"
    ]
  },
  {
    "name": "Skin V",
    "color": [0.283, 0.148, 0.079],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.4,
    "subsurfaceRadius": [0.367, 0.137, 0.068],
    "density": 1020,
    "category": ["Human"],
    "group": "Skin",
    "description": "",
    "sources": [
      "https://www.spiedigitallibrary.org/journals/journal-of-biomedical-optics/volume-17/issue-9/090901/Optical-properties-of-human-skin/10.1117/1.JBO.17.9.090901.full?SSO=1",
      "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3699319/",
      "http://graphics.ucsd.edu/~henrik/papers/skin_bssrdf/skin_bssrdf.pdf",
      "http://www.iryoku.com/downloads/Next-Generation-Character-Rendering-v6.pptx",
      "https://graphics.stanford.edu/papers/bssrdf/bssrdf.pdf",
      "https://renderman.pixar.com/resources/RenderMan_20/subsurface.html",
      "https://spectraldb.com/measurements/00396/"
    ],
    "tags": ["epidermis", "sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/skin-v.jpeg"
    ]
  },
  {
    "name": "Skin VI",
    "color": [0.09, 0.05, 0.02],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.4,
    "subsurfaceRadius": [0.367, 0.137, 0.068],
    "density": 1020,
    "category": ["Human"],
    "group": "Skin",
    "description": "",
    "sources": [
      "https://www.spiedigitallibrary.org/journals/journal-of-biomedical-optics/volume-17/issue-9/090901/Optical-properties-of-human-skin/10.1117/1.JBO.17.9.090901.full?SSO=1",
      "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3699319/",
      "http://graphics.ucsd.edu/~henrik/papers/skin_bssrdf/skin_bssrdf.pdf",
      "http://www.iryoku.com/downloads/Next-Generation-Character-Rendering-v6.pptx",
      "https://graphics.stanford.edu/papers/bssrdf/bssrdf.pdf",
      "https://renderman.pixar.com/resources/RenderMan_20/subsurface.html",
      "https://spectraldb.com/measurements/00414/"
    ],
    "tags": ["epidermis", "sss"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/skin-vi.jpeg"
    ]
  },
  {
    "name": "Snow",
    "color": [0.85, 0.85, 0.85],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.3098,
    "density": 100,
    "densityRange": [90, 450],
    "acousticAbsorption": [0.45, 0.75, 0.9, 0.95, 0.95, 0.95],
    "category": ["Crystal"],
    "description": "",
    "sources": [
      "https://seblagarde.wordpress.com/2011/08/17/feeding-a-physical-based-lighting-mode/",
      "https://refractiveindex.info/?shelf=3d&book=crystals&page=ice",
      "https://web.archive.org/web/20230605174450/http://mapleintegration.com/sound_ab.php"
    ],
    "tags": ["ice"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/snow.jpeg"
    ]
  },
  {
    "name": "Soap Bubble",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1,
    "transmission": 1,
    "thinFilmThickness": 500,
    "thinFilmIor": 1.4,
    "density": 0,
    "category": ["Organic"],
    "description": "The colors of a soap bubble are the result of an interaction between the light reflected from the front and back surfaces of the soap film, a phenomenon known as thin-film interference. The thickness of a soap bubble can range between 10 nm and 1000 nm. It's thinner at the top due to gravity.",
    "sources": [
      "https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_standard_surface_ac_standard_thinfilm_html",
      "https://soapbubble.fandom.com/wiki/Color_and_Film_Thickness",
      "https://en.wikipedia.org/wiki/Thin-film_interference#Soap_bubble"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/soap-bubble.jpeg"
    ]
  },
  {
    "name": "Stainless Steel",
    "color": [0.685, 0.637, 0.554],
    "metalness": 1,
    "specularColor": [0.804, 0.791, 0.714],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [2.22981, 4.21948, 2.04109, 3.64081, 2.15682, 3.07445],
    "density": 8000,
    "densityRange": [7500, 8000],
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=stainless_steel",
      "https://en.wikipedia.org/w/index.php?title=Stainless_steel&oldid=1274079682"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/stainless-steel.jpeg"
    ]
  },
  {
    "name": "Tire",
    "color": [0.023, 0.023, 0.023],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 0,
    "category": ["Manmade"],
    "description": "Car tire.",
    "sources": [
      "https://github.com/AntonPalmqvist/physically-based-api/tree/main/data/materials/tire/",
      "https://en.wikipedia.org/wiki/Tire"
    ],
    "tags": ["tyre", "rubber"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/tire.jpeg"
    ]
  },
  {
    "name": "Titanium",
    "color": [0.633, 0.578, 0.503],
    "metalness": 1,
    "specularColor": [0.728, 0.68, 0.55],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [2.55584, 3.89385, 2.52916, 3.39243, 2.8235, 2.85229],
    "density": 4540,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=titanium",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/titanium.jpeg"
    ]
  },
  {
    "name": "Toner (black)",
    "color": [0.05, 0.05, 0.05],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 0,
    "category": ["Manmade"],
    "description": "Black toner printed on office paper with linear sRGB values of 0, 0, 0.",
    "sources": [
      "https://github.com/AntonPalmqvist/physically-based-api/tree/main/data/materials/toner-black/",
      "https://en.wikipedia.org/wiki/Toner_(printing)"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/toner-black.jpeg"
    ]
  },
  {
    "name": "Tungsten",
    "color": [0.518, 0.495, 0.442],
    "metalness": 1,
    "specularColor": [0.461, 0.413, 0.206],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [3.45096, 2.96613, 3.51714, 2.7338, 4.02045, 1.90549],
    "density": 19300,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=main&book=W&page=Rakic-BB",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/tungsten.jpeg"
    ]
  },
  {
    "name": "Vanadium",
    "color": [0.547, 0.525, 0.506],
    "metalness": 1,
    "specularColor": [0.474, 0.426, 0.175],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [3.6507, 3.25065, 3.72723, 3.00712, 4.94609, 2.17896],
    "density": 6100,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=main&book=V&page=Werner-DFT",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/vanadium.jpeg"
    ]
  },
  {
    "name": "Water",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.3325,
    "transmission": 1,
    "transmissionDispersion": 55.78,
    "density": 1000,
    "densityRange": [958, 1000],
    "viscosity": 1.002,
    "acousticAbsorption": [0.008, 0.008, 0.013, 0.015, 0.02, 0.025],
    "category": ["Liquid"],
    "description": "While relatively small quantities of water appear to be colorless, pure water has a slight blue color that becomes deeper as the thickness of the observed sample increases. The hue of water is an intrinsic property and is caused by selective absorption and scattering of white light. Dissolved elements or suspended impurities may give water a different color.",
    "sources": [
      "https://seblagarde.wordpress.com/2011/08/17/feeding-a-physical-based-lighting-mode/",
      "https://refractiveindex.info/?shelf=3d&book=liquids&page=water",
      "https://refractiveindex.info/?shelf=main&book=H2O&page=Daimon-21.5C",
      "https://en.wikipedia.org/wiki/Density",
      "https://en.wikipedia.org/wiki/Properties_of_water#Density_of_water_and_ice",
      "https://en.wikipedia.org/wiki/Color_of_water",
      "https://www.acoustic-supplies.com/absorption-coefficient-chart/",
      "https://www.cdc.gov/niosh/docs/80-116/",
      "https://www.engineeringtoolbox.com/water-dynamic-kinematic-viscosity-d_596.html",
      "https://en.wikipedia.org/wiki/List_of_viscosities",
      "https://nextlimitsupport.atlassian.net/wiki/spaces/rf2016docs/pages/5497120/Hybrido+Viscosity+Table",
      "https://www.researchgate.net/journal/Optics-Express-1094-4087/publication/235415649_Zoom_lens_design_using_liquid_lens_for_laparoscope/links/6609e54d10ca86798731ef50/Zoom-lens-design-using-liquid-lens-for-laparoscope.pdf"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/water.jpeg"
    ]
  },
  {
    "name": "Whiteboard",
    "color": [0.869, 0.867, 0.771],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.5,
    "density": 0,
    "category": ["Manmade"],
    "description": "",
    "sources": ["https://spectraldb.com/measurements/00074/"],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/whiteboard.jpeg"
    ]
  },
  {
    "name": "Zinc",
    "color": [0.826, 0.842, 0.801],
    "metalness": 1,
    "specularColor": [0.854, 0.922, 0.923],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [3.15207, 7.39342, 1.89133, 6.28678, 1.48736, 4.92701],
    "density": 7000,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=main&book=Zn&page=Werner-DFT",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/images/renders/cycles/600/zinc.jpeg"
    ]
  }
]