6661-39-8

2-Amino-5-nitrobenzenesulfonic acid diazo, in acid conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling, 4-(4-Aminophenyl)benzenaminedouble nitriding, first alkaline conditions and formation of accidentally coupled nitrogen compounds, and then in alkaline conditions and 4-Nitrobenzenamine diazo, in acid conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid and the product of three to three, and then will the nitro reduction.

navy blue. Soluble in water for dark red sauce, slightly soluble in alcohol. In the dark for the strong sulfuric acid, diluted red for sauce. The dye solution to join strong hydrochloric acid for dark red sauce, precipitation; Add thick dark Red sauce for sodium hydroxide solution, precipitation

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