Uniform dark green flash powder or small pieces. Soluble in cold water and hot water (for the purple solution), soluble in alcohol purple. Case of concentrated sulfuric acid was red and yellow, green, yellow and brown diluted, and then into blue and purple. In concentrated nitric acid is olive colored. The case of sodium hydroxide solution process purple precipitate, add hydrochloric acid change blue dye in the cotton material on the last drops of 10% concentrated sulfuric acid change green light yellow, dripping acidic stannous chloride solution on the dim yellow, and a green light blue ring. Dyeing tannin mordant dyeing of cotton fabrics blue purple red in incandescent light, more.