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PHYSICAL APPEARANCE WHITE POWDER WHITE POWDER ASSAY AS Na2So3% BY MASS 96% pH OF 10% SOLUTION 9 to 11 CLARITY OF 10% SOLUTION CLEAR AND COLORLESS INSOLUBLE MATTER MAX 0.05% IRON (AS FE) MAX 50 PPM 45 PPM HEAVY METAL (AS PB) MAX 15 PPM THIOSULPHATE % MAX 200 PPM FREE ALIKALI 0.1%