the flakes(thickness:1mm-2mm) ,less impurity and higher content of NaHS, lower iron.competitive price &.high quality/credit Synonyms: Sodium Hydrosulphide ,Sodium Hydrogen Sulphide, Sodium Hydrogen Sulfide, Sodium Sulfhydrate, Sodium Bisulphide.Predominance:mainly used by mill run, pesticide, dye ,leather production and organic compound. compared with other company, high purity, less impurity, ...