what causes gray hairs?
In: Biology
Hair is naturally grey or, more accurately, clear.
Look at plastic wrap on a roll or a large enough stack of Ziplock bags and you’ll see they’re grey or white as a group, even though they’re see-through by themselves.
The reason human hair looks brown, black, blonde, etc. is that the hairs are hollow, like straws, and hold a reddish-orange pigment called “melanin.” The more melanin in your hair, the darker your hair color. As you age, you have less and less melanin in your hair (and skin, though it’s less obvious), so the color fades.
Black » grey » silver » white.
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