4-Amino-6-[[4'-[(7-amino-1-hydroxy-3-sulfo-2-naphtyl)azo]-1,1'-biphenyl-4-yl]azo]-5-hydroxy-3-[(4-nitrophenyl)azo]-2,7-naphthalenedisulfonic acid trisodium salt

Preparation

4-(4-Aminophenyl)benzenamine double nitriding, and 4-Nitrobenzenamine diazo, in acid conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?and products in the coupling alkaline conditions coupled, then in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid? coupling.

Properties and Applications

blue and black. Soluble in water for dark, soluble in ethanol for blue light green. In the dark for the strong sulfuric acid to blue-black, diluted galleries for. The dye solution to join strong hydrochloric acid for navy, precipitation; Join the red light sulfuric acid 10%; Add thick sodium hydroxide solution have dark blue precipitation.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	2-3	4-5	3-4	2		2