[[4'-[[1-Hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl]azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]amino]oxoacetic acid disodium salt

3,3′-Dimethoxy-4-amino-4,-biphenyloxamic acid?diazo, and 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid coupling.

bright purple. Soluble in water for red light purple, soluble in ethanol for product red. The strong sulfuric acid for blue, for purple diluted. The dye solution to join strong hydrochloric acid has the purple precipitation; Add sodium hydroxide solution have strong purplish red precipitate.

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