trisodium 3-[[4-[[4-[(4-aminophenyl)azo]-6-sulphonatonaphthyl]azo]-6-sulphonatonaphthyl]azo]-4-hydroxynaphthalene-1-sulphonate

Preparation

2-(4-Aminophenylamino)-2-oxoacetic acid diazo, and 5-Aminonaphthalene-2-sulfonic acid?coupling, again diazo, and 5-Aminonaphthalene-2-sulfonic acid?coupling, product to diazo, and 4-Hydroxynaphthalene-1-sulfonic acid coupling, and then 2-(4-Aminophenylamino)-2-oxoacetic acid hydrolysis base

Properties and Applications

to navy blue. Soluble in water for the navy, slightly soluble in ethanol and soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid in bright light blue to for olive, and after dilution for dark purple; In the dark purple of nitric acid solution; In strong hydrochloric acid for red light blue solution. The dye solution to join strong hydrochloric acid for violet black, precipitation; Add thick sodium hydroxide solution have blue-black precipitation; Join rare for sodium hydroxide solution of dark.