1-Naphthalenesulfonic acid, 4-amino-5-hydroxy-6-[[4'-[(4-hydroxyphenyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-, monosodium salt

3,3′-Dimethoxylbenzidine double nitriding, first, and then in phenol coupled with alkaline conditions and 4-Amino-5-hydroxynaphthalene-1-sulfonic acid coupling.

green. Soluble in water for Red sauce, easily soluble in ethanol for purple. In the dark for the strong sulfuric acid, diluted light gray light purple. The dye solution to join strong hydrochloric acid colored light unchanged, precipitation; Add thick sodium hydroxide solution discoloration.

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