History
The dyeing of hair is an ancient art. In ancient times, the dyes were obtained from plants. Some of the most well known are henna (Lawsonia inermis), indigo, Cassia obovata, senna, turmeric and amla. Others include katam, black walnut hulls, red ochre and leeks. In the 1661 book Eighteen Books of the Secrets of Art & Nature, various methods of coloring hair black, gold, green, red, yellow, and white are explained. The development of synthetic dyes for hair is traced to the 1860s discovery of the reactivity of PPD with air. Hair dyeing is now a multibillion dollar industry that involves the use of both plant-derived and synthetic dyes.
Read more about this topic: Hair Coloring
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—Howard Estabrook (1884–1978)
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—David Hume (1711–1776)