Why does clean, fresh snow appear white to the human eye?
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Snow appears white because it is made of many tiny ice crystals that scatter and reflect light in all directions. Since sunlight contains all colors of the visible spectrum, reflecting them equally makes the snow look white. Deep snowpack can sometimes look blue because deep ice absorbs red light more than blue light. Photo: Kabelleger / David Gubler (http://www.bahnbilder.ch)., Wikimedia Commons, CC BY-SA 3.0.
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Source: Wikipedia (CC BY-SA)
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