Do they? There are two pigments that make up hair colour. I guess if you’ve red hair you’ve got more of one pigment than the other, and it stops being made sooner?
I didn’t know they did. That’s interesting.
I like Richard theory. Maybe the eumelanin (that gives the colors brown-black and all the lighter/darker nuance) is produced for longer than the pheomelanin (that gives the color red and all the different nuances). More searching is needed!!!!!
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