sodium 2,6-bis[(2,4-diaminophenyl)azo]toluene-4-sulphonate

3,5-Diamino-4-methylbenzenesulfonic acid double nitriding, and Benzene-1,3-diamine (2 Moore) coupled.

brown. Soluble in water for red light yellow to orange red, and adequate soluble in alcohol. The strong sulfuric acid for olive brown, diluted red for yellow. Dye with strong hydrochloric acid solution for orange brown, have precipitation; Add thick sodium hydroxide solution discoloration.