It is a moderate reducing agent. It is a source of thiosulfate ion (S2O3-2) (dissolves silver salts). Its major use is as a fixing agent in photography for developing film and the extracting silver from ore. It is used in chrome-tanning leather and in chemical manufacture as a source of sulfide ion. It is also used in paper, textile, and gas purification.
Sodium Thiosulfate Anhydrous FCC

Wcode:19-051-002
Sales Specifications

Sodium Thiosulphate (by mass) : 98.00% Min
pH of 10% Solution :6.5 to 9.5
Insoluble in water :0.001% Max
Sodium Sulphide :0.001% Max
Iron (Fe) : 0.005% Max
Loss on drying:1.5% Max
Bulk Density :1.667 g/cc
Packing

50 lb bag, 44 bags per pallet