Sodium thiosulfate (Na2S2O3) 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.”
<Context ref.>Sodium thiosulfate - Wikipedia, the free encyclopedia. [En línia]. [Consulta: 3 juny 2006]. Disponible a: <http://en.wikipedia.org/wiki/Sodium_thiosulfate>