Preparation
mordanting Gallocyanine?or mordant Gallocyanine leuco (by N,N-dimethyl-4-nitrosobenzenamine and Gallic acid (3,4,5-Trihydroxybenzoic acid) reaction and have to (see C.I.Mordant Blue 10, C.I. 51030) in 100 ℃ or so take off carboxyl group.
Properties and Applications
red light purple. Soluble in water is blue. In concentrated sulfuric acid for shallow Brown light purple (adding Manganese dioxide for blue), after dilution to red. Dye aqueous solution to join concentrated hydrochloric acid to red; Add sodium hydroxide as dark purple.
