Benzoic acid, 3-[[1-hydroxy-6-[[[[5-hydroxy-6-[(2-methoxyphenyl)azo]-7-sulfo-2-naphthalenyl]amino]carbonyl]amino]-3-sulfo-2-naphthalenyl]azo]-, trisodium salt

3-Aminobenzoic acid diazo, in acid conditions coupled with N,N’-bis(4-hydroxy-2-sulfonaphthalene-7-yl)urea, O-Anisidine diazo, in alkaline conditions and coupled product matches.

red. Soluble in water for colourful red, soluble in ethanol Reddish orange. The strong sulfuric acid to red light purple, diluted red for quality. The dye solution to join strong hydrochloric acid have article red precipitate; Add thick sodium hydroxide solution have red light orange brown precipitation.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	4-5	5	3	1-2		1-2