The Doctors Show - Graying Hair: Dr. Jim explains how hair turns gray.
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You know I'm just going to show you kind of white hairs turn grey, if you watch this animation here, the bottom of the hair fall it bothers this little cells called melanocyte and they produce melanin and that's what produces the color in the hair. As you get older or have some sort of the hair basically looses it color and its turns white like that. Producing the grey colour you know in the scalp. And it of kind of like this if you take it you know this is a piece of glass with some shoe police on it, you loose the color it turns white.