26.4.25

Eriococcus Coriaceus
CHAPTER XVIII. Colouring Matters of Unknown Constitution.

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.

This is a scale insect occurring in clusters consisting of small pinkish-white sacs, which encases the stems of young shoots of the Eucalypti, more especially those on old or burnt stumps. These insects contain a colouring matter which dyes wool mordanted with chromium, aluminium, tin, and iron, brown, light amber, pale orangebrown and sage-green shades respectively. The colours thus obtained are not specially brilliant, and are not fast to alkalis (Gurney, Report of the Australasian Association for the Advancement of Science, 1898. Section B, 273).

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