Physical properties: black powder. Soluble in water was green black, the solubility of 100g / L (80 ° C), slightly soluble in ethanol and acetone. In case of concentrated sulfuric acid was green black red black precipitate in the diluted case of concentrated nitric acid, dark brown. Dyes in aqueous solution, case of 10% sulfuric acid was slightly red, and the case of concentrated sodium hydroxide solution was blue green, light case of copper micro-green shade of the case of iron a slight change.