Sodium Thiosulfate

CAS#:  7772-98-7

Synonyms: Sodium thiosulfate pentahydrate; sodium subsulfite; sodium thiosulphate.

Uses: Photography (fixing agent to dissolve unchanged silver salts from exposed negatives), chrome tanning, removing chlorine in bleaching and papermaking, etraction of silver from its ores, dechlorination of water, mordant, reagent, bleaching, reducing agent in chrome dyeing, sequestrant in salt (up to 0.1%), antidote for cyanide poisoning.

Hazard: May cause irritation to eyes, skin, digestive tract, respiratory tract.  Prolonged or repeated skin contact may cause dermatitis.  Use in foods restricted to 0.1%.