C.I. Direct violet 4

4-(4-Aminophenyl)benzenamine double nitriding, first in acid conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid?coupling, and then in alkaline conditions and 7-Amino-4-hydroxynaphthalene-2-sulfonic acid coupling.

dark red light purple. Soluble in water for wine red, and adequate soluble in alcohol for product red. In the dark for the strong sulfuric acid, diluted Red sauce for.

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