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Can you prevent or reverse grey hair?

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FILE — For something so universal, graying remains oddly mysterious. (Flora Hanitijo/The New York Times)

For something so universal, greying remains oddly mysterious.

PHOTO: FLORA HANITIJO/NYTIMES

Simar Bajaj

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NEW YORK – For something universal, greying remains oddly mysterious.

Each strand of hair starts out nearly translucent, and its colour is determined by melanin, essentially pigment dust. If it is packed densely, you get dark hair. Leave only a few black and brown specks, and it appears blond.

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