tetrasodium 4,4'-[(3,3'-dichloro[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[3-aminonaphthalene-2,7-disulphonate]

4-(4-Amino-3-chlorophenyl)-2-chlorobenzenamine double nitriding, and 3-Aminonaphthalene-2,7-disulfonic acid (2 Moore) coupled.

colourful red blue light. Soluble in water for red to blue light red, not soluble in ethanol and other organic solvents. The strong sulfuric acid in blue, diluted as a pale red brown. The dye solution to join strong hydrochloric acid for red light brown, have precipitation; Add thick hydrogen for quality solution uranium oxide red, precipitation; Add in 10% sodium hydroxide solution for yellow light red.

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