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ISO 10349-4:1992 Photography -- Photographic-grade chemicals -- Test methods -- Part 4: Determination of residue after ignition
standard by International Organization for Standardization, 12/01/1992
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The method is based on weighing a test portion and placing it in prepared ignition crucible, heating the crucible over a low flame to drive off any volatile matter, incineration in a furnace, cooling to room temperature in a desiccator, and reweighing.