Madder Root - Rubia tinctorium -

Madder Root - Rubia tinctorium - Description

We do offer the best quality of Madder Root - Rubia tinctorium -

---Constituents---The root contains rubian, rubiadin, ruberythric acid, purpurin, tannin, sugar and especially alizarin. Pseudopurpurin yields the orange dye and xanthopurpurin the yellow. The astringent taste, slight odour and red colour, are imparted to water or alcohol.

The most interesting of the colouring substances is the alizarin, and this is now termed dihydroscyanthraquinone. This occurs as orange-red crystals, almost insoluble in water, but readily soluble in alcohol, ether, the fixed oils and alkaline solutions. The alcoholic and aqueous solutions are rose-coloured, the ethereal, golden-yellow; the alkaline, violet and blue when concentrated, but violet red when sufficiently diluted. A beautiful rose-coloured lake is produced by precipitating a mixture of the solutions of alizarin and alum.

Alizarin was recognized by Graebe and Liebermann, in 1868, as a derivative of anthracene - a hydrocarbon contained in coal-tar, and in the same year they elaborated a method for preparing it commercially from anthracene. Upon this arose rapidly a great chemical industry, and the cultivation of Madder has, of course, decreased correspondingly until it may be said that the coaltar products have entirely displaced the natural ones.

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