... 99% is used in fixers, plating, leather, reductant, dechlorinating agent, sulfur dyeing agent.1.Another name: Sodium thiosulfate 2. Molecular formula: Na2S2O3 .5H ... density :1.729( 17 oC ). 5.Application:used in fixers, plating, leather, reductant, dechlorinating agent, sulfur dyeing agent, as a blush preventive agent, and ...