History of Hair Dye
Hair coloring is not a new practice; people have been changing their hair color since the era before Christ (1). The Romans had a preference to dark hair, and to fulfill this desire, they used boiled walnuts together with leeks to create the dye. They also used henna, sage and indigo plants to darken their hair (2). Ancient Greeks believed that blonde hair represented honor and courage and that is why men dyed their hair with harsh soaps and bleaches (3). During the Renaissance, blonde hair was considered appealing, so women would mix black sulphur, alum and honey to lighten their hair in the sun (2). In 1907, French chemist Eugene Schueller discovered the first synthetic hair dye with a new chemical called paraphenylenediamine. After his discovery, he founded the French Harmless Hair Dye Company, which the name then became L’Oreal (4).
General Features of Hair
1. Hair Anatomy
Human hair is a tissue that contains keratins that are insoluble proteins......
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