C.I. Acid Brown 87

Preparation

4-Aminobenzenesulfonic acid diazo, in alkaline conditions and 0.6 Moore 4-Hydroxy-6-(phenylamino)naphthalene-2-sulfonic acid?and 0.4 Moore 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid coupling.

Properties and Applications

red light brown. Soluble in water is red light brown orange, slightly soluble in ethanol for orange brown. The strong sulfuric acid for cherry red, for orange brown after diluted. Adding strong hydrochloric acid solution for orange brown; Add thick sodium hydroxide solution for red orange brown. Used for wool, silk and polyamide fiber dyeing and printing.