... % Max3.0Na2SO3 % Max1.0Iron(Fe) PPM15Na2CO3 % Max0.6Insoluble in water % Max0.05 ALIAS: Sodium Hydrosulphide ,Sodium Hydrogen Sulphide, ... iron , sodium sulfide, sodium carbonate, Insolubles impurity in water.dip-dying in the leather production , it can disperse the ... White needle system crystal, easily being deliquescent, soluble in water and alcohol, water solution with strong alkaline. Reacted ...