tetrasodium 2,2'-[carbonylbis[imino(2-methyl-4,1-phenylene)azo(2-methyl-4,1-phenylene)azo]]bis[5-[(4-sulphonatophenyl)azo]benzenesulphonate]

3,4′-Disulfo-4-aininoazobenzene diazo, and m-Toluidine coupling, again diazo, and m-Toluidine coupling, and then will light product for gasification.

dark orange to brown. Soluble in water and ethanol for orange brown. In the dark for the strong sulfuric acid (+ Light red purple), diluted for brown. The dye solution to join strong hydrochloric acid with brown precipitation; Add thick sodium hydroxide solution have orange brown precipitation.

Standard	Acid Resistance	Alkali Resistance	Light Fastness	Soaping		Water
				Fading	Stain	Fading	Stain
ISO	1	5	5-6	2		2
AATCC	2-3	3	5	2		2