sodium thiosulfate: Colorless and transparent crystal sodium thiosulfate1.SPECSPurity:99%MINWater insoluble: 0.01%MAXsulphide:0.001%MAXFe :0.001%MAXsize:12-16grain/gram 2.Usage: used in fixers, plating, leather, reductant, dechlorinating agent, sulfur dyeing agent, as a blush preventive agent, and as a disinfectant. and decolor agent. Sodium Thiosulfate