... Yellowish flake NaHS:70% Iron(Fe):15-20PPM Useage:mining,leather,dye,water treatment,paper manufacturer Molecular formula: NaHS Molecular ... pesticide, dye ,leather production and organic compound. compared with other company, high purity, less impurity, not easy to be intenerated,especially ... Insolubles In Water % Max0.0050.005-- sodium hydrosulfide for mining,leather,water treatment,paper manufacture