Part 3 Para-Phenylenediamine and Henna
Compound henna: Part 3 Para-phenylenediamine and Henna August Wilhelm von Hoffmann discovered para-phenylenediamine, oxidative dyes, in 1863. The first patent for its use in hair dye was taken out by Monnet in 1883.1 In Monnet’s patent, he found he could dye hair shades of brown by immersion in a solution of para-phenylenediamine or 2,5 toluenediamine, with hydrogen peroxide or another oxidizing agent. A further series of patents for coal tar derivative hair dyes were granted to H. and E. Erdmann between 1888 and 1897.2 The Erdmann patents added p-aminophenol, 2,4-diaminophenol, 2,3,6-triaminophenol, some N-substituted derivatives of p-phenylenediamine and p-aminophenol, and 1,5- dihydroxyand 1,5-diaminonapthalene to the oxidation bases. During the next thirty years, more than one hundred fifty further compounds were claimed for variants of oxidative dyes in over seventy-five patents; the early patents were held by textile companies, then formulated for fur dyes, and subsequently applied to on-head application to human hair. Oscar Fingal O'Flahertie Wills Wilde, Irish poet and playwright, (16 October 1854 – 30 November 1900) photograph by Napoleon Sarony, New York in 1882. Wilde dyed his graying hair with henna while living in Paris in the early 1890’s, but he seems to have dyed his hair with para-phenylenediamine when in prison, the dye probably causing the severe skin reactions observed during that time, 1895 – 7. Hair dye entrepreneurs tried various chemicals including the newly developed coal tar based para-phenylenediamine dyes. When applied to pelts, para-phenylenediamine was an effective 1 Corbett, J.
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