4-(4-Hydroxyanilino)diphenylamine-4,-sulfonic acid with Sodium polysulfide solution heating, in 105 ~ 106 ℃ under reflux 100 hours and then in the 70 ~ 80 ℃ blowing air, and add salt to make its precipitation. This indophenol?by 4-(Phenylamino)benzenesulfonic acid and 4-Nitrosophenol of condensation product reduction, can also be used by hydrochloric acid Manganese dioxide oxidation 4-(Phenylamino)benzenesulfonic acid?and where did 4-Aminophenol and the mixture.
Properties and Applications
blue. Blue powder. Slightly soluble in hot water, soluble in Sodium sulfide, almost colorless, insoluble in other organic solvent. In concentrated sulfuric acid for cobalt blue, blue precipitation after dilution. Used for cotton, viscose, linen fabric and vinylon/cotton blended fabric dyeing, also used in leather and paper dyeing.
