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sodium thiosulfate

a white, crystalline salt, NaSO, used as an antichlor, as a fixing agent in photography, etc.: popularly called sodium hyposulfite or hypo

See sodium thiosulfate in American Heritage Dictionary 4

noun
A white, translucent crystalline compound, Na2S2O3·5H2O, used as a photographic fixing agent and as a bleach. Also called hypo1, hyposulfite, sodium hyposulfite.

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