The intensity of the color of hair depends on fa presence of melanin, a dark pigment produced by specific cells located beneath the epidermis, called melanocytes, as well, people of skin, eyes and hair Dark produce this natural pigment in greater numbers than those of white skin, blue eyes and blond hair. The ability to produce melanin is determined genetically. This is the reason that some people will appear gray before others, a fact that may be linked to hormonal changes caused by emotional states. However, aging is the main cause of discoloration of hair, because with age the melanocytes lose their ability to continue to produce melanin.
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