sodium hyposulfite


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sodium hyposulfite

so′dium thiosul′fate



n.
a white, crystalline, water-soluble powder, Na2S2O3∙5H2O, used as a bleach and in photography as a fixing agent. Also called hypo, hyposulfite, sodium hyposulfite.
[1880–85]
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A more lasting solution to image fixing resulted from the observation made by the astronomer Sir John Herschel (1792-1871) that sodium hyposulfite (thiosulfate) had silver-dissolving properties.