Article: The Century of Hair Color.(hair colorings industry)

A look at the history of the hair dye industry--pioneers, research, and brands--from the beginning of the 20th century and beyond

ALTHOUGH VARIOUS natural materials--particularly henna and indigo--have been used to color hair for at least 3,000 years, several factors contributed to making the 20th century "the century of hair color." The development of synthetic organic chemistry occurred in the latter half of the 19th century, along with the discovery by Hoffman, in 1863, that para-phenylenediamine produced a brown-black coloration when oxidized. But the slowness of technology transfer delayed the commercial exploitation of the discovery until the 20th century. ...

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