... plating, leather, reductant, dechlorinating agent, sulfur dyeing agent, SOdium thiosulphate is used in fixers, plating, leather, reductant, dechlorinating ... agent, sulfur dyeing agent, Sodium thiosulphate1, Chemical name: Sodium thiosulphate 2, Structural formula:3, Molecular formula: Na2S2O2 ... Water Insoluble matter≤0.01%≤0.03%≤0.03%Sulfide≤0.001%≤0.003%≤0.001%Fe≤0. ...