disodium 7-[(4-aminobenzoyl)amino]-4-hydroxy-3-[[4-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-2-sulphonate

4-((4-Aminophenyl)diazenyl)benzenesulfonic acid diazo, and 7-(4-Aminobenzamido)-4-hydroxynaphthalene-2-sulfonic acid coupling.

blue-ray red. Soluble in water for blue-ray red. The strong sulfuric acid for blue-ray purple, dilute red after brown precipitation. The dye solution to join strong hydrochloric acid with brown precipitation; Add thick sodium hydroxide solution for blue purple.

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