Colorless needle crystal. Easy deliquescence. Hydrogen sulfide is liberated at the melting point. Soluble in water and alcohol. The aqueous solution is highly alkaline. Hydrogen sulfide is formed by acid reaction. Bitter taste. Dye industrial preparation of sulphur dyes used for synthesis of organic intermediates and additives, used for hair removal and tanning rawhide leather industry, fertilizer industry is used to remove the activated carbon desulfurization agent of monomer sulfur and mining industry for a lot of copper processing, in the production of synthetic fibers used for sulfurous acid dyeing, etc., is a manufacturer of ammonium sulfide and pesticide ethanethiol semi-finished materials, also used for waste water treatment, etc. The gas is absorbed by sulphide or caustic soda solution.