response: That's interesting! The main reasons people dye their hair is to cover gray or to make it seem more fashionable, or just to restore the original color.
original_response: No, I've never dyed my hair, but I've been thinking of doing it recently, due to my gray hair.
history: Have you ever colored your hair? I made mine purple once as a kid!
knowledge: The main reasons for this are cosmetic: to cover gray or white hair, to change to a color regarded as more fashionable or desirable, to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching.