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Dense Hair: The most obvious function of hair is Insulation against cold and heat. In cold climates a thick coat of hair serves to conserve body heat; in warm climates a thin coat of hair protects the body from the sun's rays. Hair also protects the body in other ways. Dense hair helps to cushion hard blows; eyebrows hold back sweat and block excessive light that may impair vision; small hairs in the nostrils and ears trap dust and other foreign bodies; and the eyelashes, when touched, activate nerve circuits that close the eyelids. The pattern of color in an animal's coat sometimes provides camouflage.
Washing. Clean, healthy hair is the basis of any hair style. In addition to brushing, dry hair requires shampooing once a week, oily hair perhaps every day. Shampoos are soapy or synthetic detergents in liquid, gel, lotion, or cream form and may have special uses. There are nondrying shampoos for normal hair, egg shampoos to add sheen to dry hair, and lemon shampoos to cut dyed their long hair and square beards black crimped and curled them with curling irons. imes wigs were worn. Persian nobles also their hair and beards and stained them red henna.
austere republican Rome, men and women 1.y followed simple Greek styles, but under _ire the upper classes used curling irons the men dusted their hair with colored or gold dust. Women dyed their hair . with yellow soap or wore ebony wigs or made from the blond hair of captive bar-. Their hair was piled high in curls and , sometimes arranged on crescent-shaped rire frames. Throughout the ancient world hair-iessing and shaving were accomplished by domestic slaves or in public barbershops.
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