Thiosulphate

A Solid having formula H2-O3-S2-2K.

Sodium thiosulfate (Na₂S₂O₃), also spelled sodium thiosulphate, is a colorless crystalline compound that is more familiar as the pentahydrate, Na₂S₂O₃•₅H₂O, an efflorescent, monoclinic crystalline substance also called sodium hyposulfite or “hypo.”

Thiosulfate (S₂O₃²⁻), sometimes spelled Thiosulphate[1], is an oxyanion of sulfur produced by the reaction of sulfite ions with elemental sulfur in boiling water. Thiosulfate occurs naturally in hot springs and geysers, and is produced by certain biochemical processes. It instantly dechlorinates water, and is notable for its use to halt bleaching in the paper-making industry. Thiosulfate is also useful in smelting silver ore, in producing leather goods, and to set dyes in textiles.

Sodium thiosulphate.