... high purity,not easy to be intenerated,especially less iron,sodium sulfide,sodium carbonate,insolubles impurity in water,dip-dying in the leather ... solution with strong alkaline. Reacted with acids and liberates hydrogen sulfide. Industrial grade is generally in solution form with pale yllow ... from being deliquescent.Sperated from acids,acidic materials,oxidizing agents. Sell Sodium Hydrosulphide Solid