sodium thiosulfatesodium thiosulfate
a white, crystalline salt, NaSO, used as an antichlor, as a fixing agent in photography, etc.: popularly called sodium hyposulfite or hypo
A white crystalline compound, Na2S2O3, often prepared as a pentahydrate, used as a photographic fixing agent, as a bleach and antichlor, as an antidote for cyanide poisoning, and as an antifungal agent. Also called hypo 1. Also called hyposulfite . Also called sodium hyposulfite .