... 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: ... intenerated,especially less iron , sodium sulfide, sodium carbonate, Insolubles impurity in water ...