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ISO 10349-2:1992 Photography -- Photographic-grade chemicals -- Test methods -- Part 2: Determination of matter insoluble in water
standard by International Organization for Standardization, 12/01/1992
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The method is based on transfer of the test portion in a conical flask containing water, heating on a steam bath, filtering through a dry porous crucible, washing with hot water, drying the crucible plus residue, and reweighing.