Diese Substanz wird im Colour Index durch Colour Index Constitution Number, C.I. 53470, identifiziert.

synthetische4-(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 indophenolby 4-(Phenylamino)benzenesulfonic acid and 4-Nitrosophenol of condensation product reduction, can also be used by hydrochloric acid Manganese dioxide oxidation 4-(Phenylamino)benzenesulfonic acidand where did 4-Aminophenol and the mixture.