disodium 3,3'-[(3,3'-dichloro[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis(4-aminonaphthalene-1-sulphonate)

4-Aminonaphthalene-1-sulfonic acid double nitriding, and 4-Hydroxynaphthalene-1-sulfonic acid (2 Moore) coupled.

blue-ray red. Soluble in water for red to blue light red, soluble in ethanol for red orange, slightly soluble in acetone. The strong sulfuric acid for blue, shallow blue for diluted. The dye solution to join strong hydrochloric acid for red sauce, precipitation; Add thick sodium hydroxide solution for product red, precipitation.

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