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sodium thiosulphate

noun
1.
a white soluble substance used, in the pentahydrate form, in photography as a fixer to dissolve unchanged silver halides and also to remove excess chlorine from chlorinated water. Formula: Na2S2O3 Also called (not in technical usage) sodium hyposulphite, hypo
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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