Hair is a protein filament that grows from follicles found in the dermis.Hair is one of the defining characteristics of mammals.The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair.Most common interest in hair is focused on hair growth, hair types, and hair care, but hair is also an important biomaterial primarily …Hair coloring or hair dyeing is changing the color of hair.Common reasons are to cover gray hair, to change to a color that a person likes better, and to return the hair to its normal color after it has been badly changed by hairdressing or sun bleaching.The 1661 book Eighteen Books of the Secrets of Art Nature explained ways of coloring hair black, gold, green, red, yellow, and …
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