5-Amino-3-[[4'-[[2,4-diamino-5-[[3-[(2,4-diaminophenyl)azo]phenyl]azo]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxynaphthalene-2,7-disulfonic acid disodium salt

Preparation

4-(4-Aminophenyl)benzenamine double nitriding, first in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?coupling, and then and C.I. Basic Brown 1 (with 2 moles of nitrous acid treatment with 3 moles of??Benzene-1,3-diamine?dihydrochloride derived)?coupled.

Properties and Applications

black light brown. Moderate soluble in water for violet black, soluble in ethanol for shallow violet brown. The strong sulfuric acid for blue-ray black, diluted for shallow violet brown. Dye with strong hydrochloric acid solution for red sauce; Add thick sodium hydroxide solution for sauce also red.