Preparation
4-(4-Aminophenyl)benzenamine double nitriding, in acid conditions coupled with 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid, 2,5-Diaminobenzenesulfonic acid diazo, in alkaline conditions and the above the products of coupling, and then and Naphthalene-2,7-diamine?coupling.
Properties and Applications
soluble in water for red light black. The strong sulfuric acid for blue, red and black after diluted precipitation. In water solution to join strong hydrochloric acid or sodium hydroxide without change
![4-Amino-3-[[4'-[(2,7-diamino-1-naphtyl)azo]-1,1'-biphenyl-4-yl]azo]-5-hydroxy-6-[(4-nitro-2-sulfophenyl)azo]-2,7-naphthalenedisulfonic acid trisodium salt Structure](https://www.chemicalbook.com/CAS2/GIF/6360-59-4.gif)