Red light yellow. Yellow-brown powder. Soluble in nitrobenzene, four hydrogenated naphthalene, and dimethyl benzene, slightly soluble in acetone, ethanol, benzene, chloroform, o-chlorophenol, Pyridine, and toluene. The strong sulfuric acid to red light purple, orange after diluted precipitation, in alkaline insurance powder is in stock for purplish red color; In the acidic insurance powder also in stock for golden brown. It can be used for the discharge printing of cotton, mainly used in the winter sun often dark cotton print, also suitable for silk and polyamide fiber dyeing.