4-[[4-[(2,4-Dinitrophenyl)amino]phenyl]azo]benzenesulfonic acid sodium salt

Preparation

(a) 4-((4-Aminophenyl)diazenyl)benzenesulfonic acid?and 1-Chloro-2,4-dinitrobenzene?condensation;

Properties and Applications

red light yellow. Soluble in water for orange. The strong sulfuric acid for blue-ray red, diluted for red, and then into a orange solution and the emergence of precipitation. Its water solution with hydrochloric acid appears orange brown precipitation; Add sodium hydroxide for darker brown. Can be used for wool, silk dyeing and printing.