gallocyaninen.
/ɡaləʊˈsʌɪəniːn//ɡaləʊˈsʌɪənɪn/ Chemistry.
A green crystalline substance, C15H12N2O5, obtained from gallic acid and used as a bluish-violet mordant dye for wool and cotton and in calico-printing; also, any of a group of structurally similar dyes of the oxazine series that are derived from gallic acid.
ΚΠ
1883 H. Kœchlin in Chem. News 13 Apr. 170/1 By allowing an alcoholic solution of nitroso-dimethylaniline hydrochlorate to react in heat upon the tannins, as upon gallic acid, there are obtained violet colouring-matters, verging more or less upon a blue according to the nature of the tannin employed. These colouring-matters..the author names gallo-cyanines.
1893 E. Knecht et al. Man. Dyeing II. vii. 624 Gallocyanin yields a bright blue-violet shade, which resists light, soap, and acids very well, but is not fast to soda.
1956 Hickinbottom & Garwood in E. H. Rodd Chem. Carbon Compounds III b. xii. 781 The so-called gallocyanine dyes, mordant dyes of the oxazine series, largely used in calico printing.
1958 J. R. Baker Princ. Biol. Microtechnique xii. 242 A basic dye may be used..to obtain an approximation to the amount of DNA in a nucleus or of RNA in a nucleolus or in the cytoplasm. A mordant-dye, chrome alum/gallocyanine..is particularly recommended for this purpose.
1960 H. T. Howard & G. R. Ramage in E. H. Rodd Chem. Carbon Compounds IV c. xvii. 1546 The gallocyanines..are important for application in calico printing, with chromium salts and tannin mordant.
This entry has not yet been fully updated (first published 1972; most recently modified version published online December 2020).
<
n.1883