Human hair color

Human hair color is the pigmentation of human hair follicles and shafts due to two types of melanin: eumelanin and pheomelanin. Generally, the more melanin present, the darker the hair. Its tone depends on the ratio of black or brown eumelanin to yellow or red pheomelanin.

Melanin levels can vary over time, causing a person's hair color to change, and one person can have hair follicles of more than one color.
Some hair colors are associated with some ethnic groups because of the observed higher frequency of particular hair colors within their geographical region, e.
g.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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