... 2000MT Predominance: the flakes(thickness:1mm-2mm) ,less impurity and higher content of NaHS, lower iron.ITEMContentFlakeLiquid ... FlakeYellowish Flake Synonyms: Sodium Hydrosulphide ,Sodium Hydrogen Sulphide, Sodium Hydrogen Sulfide, Sodium Sulfhydrate, Sodium Bisulphide.Predominance: ... less iron , sodium sulfide, sodium carbonate, Insolubles impurity in water.dip-dying in the leather production ...