Why white things are white

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Almost all white things are white because of scattering. You can do really cool things by playing with refractive index to dial up or down the amount of scattering, you can even make things disappear. It's how a Buddha Board works!

Image credit - TiO2 crystals - Materialscientist (https://commons.wikimedia.org/wiki/File:TiO2crystals.JPG)

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