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By Goldstein I.S. (ed.)

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Henna, a vegetable dye with an active component called lawsone (2-hydroxy-1,4-naphthoquinone), has been used throughout the centuries to give hair a red-orange tint. In addition, weak solutions of hydrogen peroxide were and currently are used as hair bleaches. A French chemist formulated the first synthetic hair dye in 1907. It was this basic formulation that the modern technology of changing hair color, accomplished through the reactions of complex synthetic organic and organometallic chemicals, is based upon.

Eccrine glands are distributed throughout most of the skin and are highly concentrated on the palms, soles, forehead, face, and axillae (armpits). , sodium, potassium, and chloride), lactic acid, ascorbic acid, amino acids, urea, uric acid, ammonia, and glucose. This secretion tends to have no odor, and the body may be generally cooled after the evaporation of skin surface water from the eccrine-based sweat. , Staphylococcus species) may act on perspiration residue and sebum (natural body oil) to produce unpleasant odiferous products such as short-chain fatty acids and amines.

Sodium tetraborate (Na2B4O7·10H2O) is also known as borax, and this product alone is marketed as a laundry aid. However, borates are somewhat toxic. While the potentially deleterious effects of 20 CHEM I CAL COMP OS I T I ON OF E V E R Y D A Y P R O D U C T S borax exposure in humans are currently being investigated, boron is specifically toxic to citrus crops, and detergent runoff must be avoided during irrigation. Oxygen-releasing bleaches are generally less active than chlorine bleaches and require higher temperatures, higher alkalinity, and higher concentrations for working efficiency.

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