2-Amino-4-nitrophenol diazo, and 2,4-Diaminobenzenesulfonic acid coupling, and then translate to iron complex.
Properties and Applications
dark brown. Soluble in water and ethanol for yellow to yellow brown, soluble in soluble fiber element, slightly soluble in acetone, insoluble in other organic solvents. The strong sulfuric acid to red light brown, after diluted orange precipitation; In nitric acid solution for red, and then into a yellow brown solution. The dye solution to join strong hydrochloric acid is palm orange; Add thick sodium hydroxide solution for orange.
