Why does sunlight darken skin but lighten the colour of other surfaces?
In: 30
The tanning of skin is much more complicated than photo-bleaching of pigments. It’s a biological process that manufactures new pigments in response to damage from the Sun’s UV light, in order to prevent future sunburns. In photo-bleaching, the pigments that give a substance color are damaged by UV light, changing their chemical properties and destroying their color, and that’s it.
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