Sodium thiosulfate used in fixers, plating,, reductant, dechlorinating agent, sulfur dyeing ... with the test----Granularity(g/g)12~16-------Sodium thiosulfate (Na2S2O3), also spelled sodium thiosulphate, is a colorless crystalline compound that ... , an efflorescent, monoclinic crystalline substance also called sodium hyposulfite or “hypo.”The thiosulfate anion is tetrahedral in shape and is notionally ...