Yellow Cedar(CHAPTER VII. Flavonol Group.)

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.

The Rhodosphacra rhodanthema (Engl.) or yellow cedar, a tree growing to the height of 70 or 80 feet, is indigenous to the northern part of New South Wales.

The colouring matter of this dyewood is fisetin, which is readily isolated by the method described in connection with young fustic (Perkin, Chem. Soc. Trans., 1897, 71, 1194).

A second substance, C₃₆H₃₀O₁₆?, colourless needles, melting-point 215-217°, is also present in small amount, and may be identical with fustin, the glucoside of fisetin obtained from young fustic by Schmid (Ber., 1886, 19, 1755).

The shades given by the yellow cedar are slightly weaker and differ considerably from those given by young fustic (Rhus cotinus), although both contain the same colouring matter. Employing mordanted woollen cloth, the following distinctions are observed:
Young fustic - Chromium. Reddish-brown; Aluminium. Orange; Tin Orange-yellow; Iron. Brown-olive
Yellow cedar - Chromium Yellowish-brown; Aluminium. Brownish-yellow; Tin Golden-yellow; Iron Olive
and these may be due to varying amounts of the glucoside which is contained in both plants.