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nature : Huang, commonly known as soap. Tan powder. Dissolved in water and ethanol was orange yellow. And slightly soluble in ether and benzene, acetone - soluble. The concentrated sulfuric acid was purple, diluted goods were red, and produce precipitation. Soap for the coloring and silk, wool, paper, leather dyeing. With barium salt, and salt role in the generation of brown color amylin for ink and paint industries. From among sulfanilic acid by diazotization after two aniline in the acid medium and coupling in the system.
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