2-Naphthalenesulfonic acid, amino[[2-methyl-4-[(2-methylphenyl)azo]phenyl]azo]-, monosodium salt

Preparation

2-Methyl-4-(o-tolyldiazenyl)benzenamine diazo, and?7-Aminonaphthalene-2-sulfonic acid?and 6-Aminonaphthalene-2-sulfonic acid coupling.

Properties and Applications

red. Soluble in water for palm, and adequate soluble in ethanol for orange red, soluble in soluble fiber element, insoluble in other organic solvents. In the strong sulfuric acid as dark blue, diluted into shallow orange and the emergence of brown precipitation. In water solution to join strong hydrochloric acid for orange brown; Add 10% sulfuric acid as shallow red; Add thick sodium hydroxide solution for orange light brown.