C.I. Direct brown 75

4-(4-Aminophenyl)benzenamine double nitriding, and 2-Hydroxybenzoic acid coupling, and then and Naphthalen-1-amine diazo, Coupled with?4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid??coupling product obtained.

dark red light brown. The strong sulfuric acid for red light blue, purple solution for red after diluted, precipitation; In the nitric acid for brown. The dye solution to join strong hydrochloric acid have dark purple precipitation; Add thick sodium hydroxide solution is palm red light.

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