[
  {
    "name": "Aluminum",
    "color": [0.912, 0.914, 0.92],
    "metalness": 1,
    "specularColor": [0.97, 0.979, 0.988],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [1.3456, 7.4746, 0.96521, 6.3995, 0.61722, 5.3031],
    "density": 2700,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=aluminium",
      "https://docs.arnoldrenderer.com/display/A5AFMUG/Base",
      "https://en.wikipedia.org/wiki/Aluminium",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["aluminium", "conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/data/materials/aluminum/aluminum-cycles.png"
    ]
  },
  {
    "name": "Blood",
    "color": [0.64448, 0.003, 0.005],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.301,
    "transmission": 1,
    "density": 1060,
    "viscosity": 3,
    "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"
    ],
    "tags": ["liquid"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/blood-cycles.png"
    ]
  },
  {
    "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/reference/render/bone-cycles.png"
    ]
  },
  {
    "name": "Brass",
    "color": [0.887, 0.789, 0.434],
    "metalness": 1,
    "specularColor": [0.988, 0.976, 0.843],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [0.444, 3.695, 0.527, 2.765, 1.094, 1.829],
    "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": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/brass-cycles.png"
    ]
  },
  {
    "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/reference/render/brick-cycles.png"
    ]
  },
  {
    "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/reference/render/charcoal-cycles.png"
    ]
  },
  {
    "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/reference/render/chocolate-cycles.png"
    ]
  },
  {
    "name": "Chromium",
    "color": [0.55, 0.556, 0.554],
    "metalness": 1,
    "specularColor": [0.57, 0.558, 0.689],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [3.1071, 3.3314, 3.1812, 3.3291, 2.323, 3.135],
    "density": 7200,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=main&book=Cr&page=Johnson",
      "https://docs.unrealengine.com/4.27/en-US/RenderingAndGraphics/Materials/PhysicallyBased/",
      "https://www.chaos.com/blog/understanding-metalness",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["chrome", "conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/chromium-cycles.png"
    ]
  },
  {
    "name": "Cobalt",
    "color": [0.662, 0.655, 0.634],
    "metalness": 1,
    "specularColor": [0.803, 0.803, 0.816],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [2.2371, 4.2357, 2.0524, 3.8242, 1.7365, 3.2745],
    "density": 8900,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=main&book=Co&page=Johnson",
      "https://docs.unrealengine.com/4.27/en-US/RenderingAndGraphics/Materials/PhysicallyBased/",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/cobalt-cycles.png"
    ]
  },
  {
    "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://docs.unrealengine.com/4.27/en-US/RenderingAndGraphics/Materials/PhysicallyBased/",
      "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/reference/render/concrete-cycles.png"
    ]
  },
  {
    "name": "Cooking Oil",
    "color": [0.737911, 0.687, 0.091],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.47,
    "transmission": 1,
    "density": 920,
    "viscosity": 60,
    "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/reference/render/cooking-oil-cycles.png"
    ]
  },
  {
    "name": "Copper",
    "color": [0.926, 0.721, 0.504],
    "metalness": 1,
    "specularColor": [0.996, 0.957, 0.823],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [0.27105, 3.6092, 0.67693, 2.6248, 1.3164, 2.2921],
    "density": 8940,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=copper",
      "https://docs.arnoldrenderer.com/display/A5AFMUG/Base",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/copper-cycles.png"
    ]
  },
  {
    "name": "Diamond",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 2.4168,
    "transmission": 1,
    "density": 3500,
    "category": ["Crystal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=crystals&page=diamond",
      "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/reference/render/diamond-cycles.png"
    ]
  },
  {
    "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/data/materials/egg-shell-cycles.png"
    ]
  },
  {
    "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/reference/render/eye-cornea-cycles.png"
    ]
  },
  {
    "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/reference/render/eye-lens-cycles.png"
    ]
  },
  {
    "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": [""]
  },
  {
    "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://docs.unrealengine.com/4.27/en-US/RenderingAndGraphics/Materials/PhysicallyBased/",
      "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/reference/render/glass-cycles.png"
    ]
  },
  {
    "name": "Gold",
    "color": [0.944, 0.776, 0.373],
    "metalness": 1,
    "specularColor": [0.998, 0.981, 0.751],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [0.18299, 3.4242, 0.42108, 2.3459, 1.3734, 1.7704],
    "density": 19320,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=gold",
      "https://docs.arnoldrenderer.com/display/A5AFMUG/Base",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/gold-cycles.png"
    ]
  },
  {
    "name": "Gray Card",
    "color": [0.18, 0.18, 0.18],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 0,
    "category": ["Calibration"],
    "description": "18% gray has a perceptual lightness of 50%.",
    "sources": ["https://en.wikipedia.org/wiki/Middle_gray"],
    "tags": ["grey"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/gray-card-cycles.png"
    ]
  },
  {
    "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/reference/render/honey-cycles.png"
    ]
  },
  {
    "name": "Ice",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.3098,
    "transmission": 1,
    "density": 917,
    "category": ["Crystal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=crystals&page=ice",
      "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/reference/render/ice-cycles.png"
    ]
  },
  {
    "name": "Iron",
    "color": [0.531, 0.512, 0.496],
    "metalness": 1,
    "specularColor": [0.571, 0.54, 0.586],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [2.9114, 3.0893, 2.9497, 2.9318, 2.5845, 2.767],
    "density": 7870,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=iron",
      "https://docs.arnoldrenderer.com/display/A5AFMUG/Base",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/iron-cycles.png"
    ]
  },
  {
    "name": "Ketchup",
    "color": [0.164, 0.006, 0.002],
    "metalness": 0,
    "roughness": 0.1,
    "ior": 1.4,
    "subsurfaceRadius": [1, 0, 0],
    "density": 1150,
    "viscosity": 50000,
    "category": ["Organic"],
    "description": "",
    "sources": [
      "https://docs.arnoldrenderer.com/display/A5AFMUG/Subsurface",
      "https://renderman.pixar.com/resources/RenderMan_20/subsurface.html",
      "https://graphics.stanford.edu/papers/bssrdf/bssrdf.pdf",
      "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"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/ketchup-cycles.png"
    ]
  },
  {
    "name": "Lead",
    "color": [0.632, 0.626, 0.641],
    "metalness": 1,
    "specularColor": [0.803, 0.808, 0.862],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [1.91, 3.51, 1.83, 3.4, 1.44, 3.18],
    "density": 11340,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=lead",
      "https://docs.arnoldrenderer.com/display/A5AFMUG/Base",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/lead-cycles.png"
    ]
  },
  {
    "name": "Mercury",
    "color": [0.781, 0.779, 0.779],
    "metalness": 1,
    "specularColor": [0.879, 0.91, 0.941],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [2.0733, 5.3383, 1.5523, 4.651, 1.0606, 3.8628],
    "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://docs.arnoldrenderer.com/display/A5AFMUG/Base",
      "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": ["conductor", "liquid"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/mercury-cycles.png"
    ]
  },
  {
    "name": "Milk",
    "color": [0.603827, 0.584, 0.497],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.348,
    "density": 1030,
    "densityRange": [1026, 1035],
    "viscosity": 2,
    "category": ["Liquid"],
    "description": "Cow's milk",
    "sources": [
      "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/supplier-network/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": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/milk-cycles.png"
    ]
  },
  {
    "name": "Nickel",
    "color": [0.649, 0.61, 0.541],
    "metalness": 1,
    "specularColor": [0.797, 0.801, 0.789],
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    "ior": 1.5,
    "complexIor": [1.99, 4.2086, 1.9212, 3.6158, 1.729, 2.9435],
    "density": 8900,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://docs.arnoldrenderer.com/display/A5AFMUG/Base",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/nickel-cycles.png"
    ]
  },
  {
    "name": "Office Paper",
    "color": [0.738, 0.768, 1],
    "metalness": 0,
    "roughness": 0.5,
    "ior": 1.5,
    "density": 0,
    "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/Optical_brightener"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/data/materials/office-paper-cycles.png"
    ]
  },
  {
    "name": "Plastic (PC)",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.5848,
    "transmission": 1,
    "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/reference/render/plastic-pc-cycles.png"
    ]
  },
  {
    "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/reference/render/plastic-pet-cycles.png"
    ]
  },
  {
    "name": "Plastic (Acrylic)",
    "color": [1, 1, 1],
    "metalness": 0,
    "roughness": 0,
    "ior": 1.476,
    "transmission": 1,
    "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/reference/render/plastic-acrylic-cycles.png"
    ]
  },
  {
    "name": "Plastic (PP)",
    "color": [1, 1, 1],
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    "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/reference/render/plastic-pp-cycles.png"
    ]
  },
  {
    "name": "Plastic (PVC)",
    "color": [1, 1, 1],
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    "roughness": 0,
    "ior": 1.531,
    "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/reference/render/plastic-pvc-cycles.png"
    ]
  },
  {
    "name": "Platinum",
    "color": [0.679, 0.642, 0.588],
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    "specularColor": [0.785, 0.789, 0.784],
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    "complexIor": [2.3757, 4.2655, 2.0847, 3.7153, 1.8453, 3.1365],
    "density": 21450,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=platinum",
      "https://docs.arnoldrenderer.com/display/A5AFMUG/Base",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/platinum-cycles.png"
    ]
  },
  {
    "name": "Salt",
    "color": [0.8, 0.8, 0.8],
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    "roughness": 0.2,
    "ior": 1.5275,
    "transmission": 1,
    "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/reference/render/salt-cycles.png"
    ]
  },
  {
    "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": []
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  {
    "name": "Sapphire",
    "color": [0.67, 0.764, 0.855],
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    "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/reference/render/sapphire-cycles.png"
    ]
  },
  {
    "name": "Silver",
    "color": [0.962, 0.949, 0.922],
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    "specularColor": [0.999, 0.998, 0.998],
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    "complexIor": [0.15943, 3.9291, 0.14512, 3.19, 0.13547, 2.3808],
    "density": 10500,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=silver",
      "https://docs.arnoldrenderer.com/display/A5AFMUG/Base",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/silver-cycles.png"
    ]
  },
  {
    "name": "Skin I",
    "color": [0.847, 0.638, 0.552],
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    "roughness": 0.5,
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    "subsurfaceRadius": [1, 0.35, 0.2],
    "density": 1020,
    "category": ["Human"],
    "group": "Skin",
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      "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"
    ],
    "tags": ["epidermis"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/skin-i-cycles.png"
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    "name": "Skin II",
    "color": [0.799, 0.485, 0.347],
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    "category": ["Human"],
    "group": "Skin",
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      "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"
    ],
    "tags": ["epidermis"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/skin-ii-cycles.png"
    ]
  },
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    "name": "Skin III",
    "color": [0.6, 0.31, 0.22],
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    "subsurfaceRadius": [1, 0.35, 0.2],
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      "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"
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    "tags": ["epidermis"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/skin-iii-cycles.png"
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    "name": "Skin IV",
    "color": [0.43, 0.2, 0.13],
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      "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"
    ],
    "tags": ["epidermis"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/skin-iv-cycles.png"
    ]
  },
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    "name": "Skin V",
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    "subsurfaceRadius": [1, 0.35, 0.2],
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    "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"
    ],
    "tags": ["epidermis"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/skin-v-cycles.png"
    ]
  },
  {
    "name": "Skin VI",
    "color": [0.09, 0.05, 0.02],
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    "subsurfaceRadius": [1, 0.35, 0.2],
    "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"
    ],
    "tags": ["epidermis"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/skin-vi-cycles.png"
    ]
  },
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    "name": "Snow",
    "color": [0.81, 0.81, 0.81],
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    "roughness": 0.5,
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    "density": 0,
    "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",
      "http://mapleintegration.com/sound_ab.php"
    ],
    "tags": ["ice"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/snow-cycles.png"
    ]
  },
  {
    "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/data/materials/tire-cycles.png"
    ]
  },
  {
    "name": "Titanium",
    "color": [0.616, 0.582, 0.544],
    "metalness": 1,
    "specularColor": [0.689, 0.683, 0.689],
    "roughness": 0,
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    "complexIor": [2.7407, 3.8143, 2.5418, 3.4345, 2.267, 3.0385],
    "density": 4540,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=3d&book=metals&page=titanium",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/titanium-cycles.png"
    ]
  },
  {
    "name": "Tungsten",
    "color": [0.92549, 0.83529, 0.75686],
    "metalness": 1,
    "specularColor": [0.983, 0.944, 0.854],
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    "complexIor": [0.92074, 6.8595, 1.3437, 5.2293, 2.2323, 5.1461],
    "density": 19300,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://www.chaosgroup.com/blog/understanding-metalness",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/tungsten-cycles.png"
    ]
  },
  {
    "name": "Vanadium",
    "color": [0.9451, 0.89412, 0.78039],
    "metalness": 1,
    "specularColor": [0.5, 0.395, 0.512],
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    "ior": 1.5,
    "complexIor": [3.3121, 3.075, 3.9948, 3.0388, 3.5865, 3.4615],
    "density": 6100,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://www.chaosgroup.com/blog/understanding-metalness",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/vanadium-cycles.png"
    ]
  },
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    "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://docs.unrealengine.com/4.27/en-US/RenderingAndGraphics/Materials/PhysicallyBased/",
      "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/pdfs/80-116.pdf?id=10.26616/NIOSHPUB80116",
      "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"
    ],
    "tags": [""],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/water-cycles.png"
    ]
  },
  {
    "name": "Zinc",
    "color": [0.87451, 0.86667, 0.8549],
    "metalness": 1,
    "specularColor": [0.96, 0.97, 0.977],
    "roughness": 0,
    "ior": 1.5,
    "complexIor": [1.2338, 5.873, 0.92943, 4.9751, 0.67767, 4.0122],
    "density": 7000,
    "category": ["Metal"],
    "description": "",
    "sources": [
      "https://refractiveindex.info/?shelf=main&book=Zn&page=Werner",
      "https://www.chaosgroup.com/blog/understanding-metalness",
      "https://en.wikipedia.org/wiki/Density"
    ],
    "tags": ["conductor"],
    "reference": [
      "https://raw.githubusercontent.com/AntonPalmqvist/physically-based-api/main/reference/render/zinc-cycles.png"
    ]
  }
]