Nietzki, Rudolf, 1847-1917, Collin, A., Richardson, W. · London, Gurney & Jackson · leaf 110
peculiar in so far that it possesses the lake-forming properties characteristic of the alizarin dyes, and is at the same time a weak base. Alizarin blue was discovered by Prud'homme [28], and the determination of its constitution by Graebe [29] led to the synthesis of quinoline by Skraup from… … In the pure state (crystallised from benzene) it forms brownish- violet needles, insoluble in water and difficultly soluble in ether and alcohol. It melts at 270°, and sublimes, forming orange vapours. It dissolves in alkalies with a blue colour, an excess of alkali turning the solution green. Its…
Dyes and dyeing -- Chemistry · Coal-tar colors
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