Question

why the colour of hair is black

Answer 1

Color of hair is black due to melanin substance. It is a dominant genetic trait and it is found in all people. Melanin is a substance that caused for hair color and skin color of people. The presence of blackeumelanin in high concentration makes our hair black.
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Answer 2

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Two types of pigment give hair itscolor: eumelanin and pheomelanin. Pheomelanin colors hair orange an
d red. All humans have some pheomelanin in their hair. Eumelanin, which has two subtypes of black or brown, determines the darkness of the hair color.

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