The Natural Organic Colouring Matters
By
Arthur George Perkin, F.R.S., F.R.S.E., F.I.C., professor of colour chemistry and dyeing in the University of Leeds
and
Arthur Ernest Everest, D.Sc., Ph.D., F.I.C., of the Wilton Research Laboratories; Late head of the Department of Coal-tar Colour Chemistry; Technical College, Huddersfield
Longmans, Green and Co.
39 Paternoster Row, London
Fourth Avenue & 30th Street, New York
Bombay, Calcutta, and Madras
1918
Kaikki kuvat (kemialliset kaavat) puuttuvat // None of the illustrations (of chemical formulas) included.
Onosma echoides is a biennial plant frequent throughout the Western Himalaya from Kashmir to Kumaon. It is widely distributed from Siberia and Carbut to France (Watt's "Dictionary of Economic Products of India," 1891, 5, 487). The roots are violet coloured and yield a dye which is readily extracted by alcohol, giving a red solution, but this is very sparingly soluble in water. In various districts of India it is employed for dyeing wool, and on account of its solubility in oils and fats, to which it imparts a red colour, is also used as a substitute for alkanet. According to Watt (loc. cit.} the bruised root is employed medicinally as also are the leaves and flowers of this plant.
The general properties and colour reactions of the dye present in the root are very similar to those given by alkanet, and there can be little doubt that it contains either the same or closely allied colouring matters (Perkin, private communication).
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