Sodium thiosulphate pentahydrate is an inorganic compound with the formula Na₂S₂O₃. 5H₂O . Sodium thiosulfate pentahydrate is a hydrate consisting of sodium thiosulfate with 5 mol eq. of water.It is white or colorless crystals. Sodium thiosulfate is used in the treatment of cyanide poisoning. Other uses include topical treatment of ringworm and tinea versicolor, and treating some side effects of hemodialysis and chemotherapy. Sodium thiosulfate is used predominantly in dyeing. It converts some dyes to their soluble colorless 'leuco' forms. It is also used to bleach 'wool, cotton, silk, ...soaps, glues, clay, sand, bauxite, and... edible oils, edible fats, and gelatin.