... ) ,less impurity and higher content of NaHS, lower iron.competitive price &.high quality/credit Synonyms: Sodium Hydrosulphide ,Sodium Hydrogen ... , less impurity, not easy to be intenerated,especially less iron , sodium sulfide, sodium carbonate, Insolubles impurity in water. ... production , it can disperse the fibre equably. less iron insure the appearance and good quality of leather.Producing Method ...