Dye - Synthetic, Organic, Colorants

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Dyerswoad, Isatis tinctoria, is a source of indigo, considered the oldest known dye.

The visible spectrum, which represents the portion of the electromagnetic spectrum that is visible to the human eye, absorbs wavelengths of 400–700 nm.

Some tanneries, such as that in Fès, Morocco, still rely on vat dyeing to tan leather.

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Perkin’s accidental discovery of mauve as a product of dichromate oxidation of impure aniline motivated chemists to examine oxidations of aniline with an array of reagents. Sometime between 1858 and 1859, French chemist François-Emmanuel Verguin found that reaction of aniline with stannic chloride gave a fuchsia, or rose-coloured, dye, which he named fuchsine. It was the first of the triphenylmethane dyes and triggered the second phase of the synthetic dye industry. Other reagents were found to give better yields, leading to vigorous patent activity and several legal disputes. Inadvertent addition of excess aniline in a fuchsine preparation resulted in the ...(100 of 7982 words)

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