disodium 3(or 5)-[[4-[(7-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]-1-naphthyl]azo]salicylate

Preparation

3-Amino-2-hydroxybenzoic acid coupling, again diazo, in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid? coupling.

Flammability and Explosibility

Not classified

Properties and Applications

blue gray. To black powder. Soluble in water, slightly soluble in ethanol, insoluble in other organic solvents. The strong sulfuric acid dyes for green, diluted into red sauce, precipitation. The dye solution for violet black, join after strong hydrochloric acid by purplish red color into red sauce, precipitation; Add thick hydrogen uranium oxide solution to dark purple, have precipitation. Water-soluble general, sensitive to that fights. Dyeing copper and iron ion in the blue light. Used for cotton, viscose and their blended fabric dyeing and silk, cotton or viscose fabric can be in directly on printing, also used in leather and fur and paper color. And disperse dyestuffs high temperature on polyester with bath/cotton blended fabric dyeing.