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ISO 10636:1994
M00006574
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ISO 10636:1994 Photography -- Processing chemicals -- Specifications for anhydrous sodium thiosulfate and sodium thiosulfate pentahydrate
standard by International Organization for Standardization, 05/01/1994
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Specifies the purity requirements and describes the test methods for insoluble matter, heavy metals content, iron, alkalinity, acidity, sulfide content, pH value, appearance of solution.