Normally, when activated by a certain hormone, MC1R sparks a series of signals that leads to the production of brown or black pigment.
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Sometimes, red hair darkens as people get older, becoming a more brownish color or losing some of its vividness. The Telegraph. Gorgeous brunette with freckles in studio Beautiful red haired woman enjoying life Beautiful red haired woman enjoying life Sword Beauty woman with long curly hair.
As previously estimated by BBC News , between one and two percent of the world's population -- or 70 to million people -- are redheads. Characterized by high levels of the reddish pigment pheomelanin and relatively low levels of the dark pigment eumelanin , it is associated with fair skin color , lighter eye color , freckles , and sensitivity to ultraviolet light.