Sodium thiosulfate (Na2S2O3) solution is used in photography to फोटोग्राफी में सोडियम थायोसल्फेट (Na2S2O3) विलयन का प्रयोग क्यों किया जाता है?

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Sodium thiosulfate (Na2S2O3) solution is used in photography to फोटोग्राफी में सोडियम थायोसल्फेट (Na2S2O3) विलयन का प्रयोग क्यों किया जाता है?