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

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.

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