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ISO 10349-10:1992 Photography -- Photographic-grade chemicals -- Test methods -- Part 10: Determination of sulfide content
standard by International Organization for Standardization, 12/01/1992
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The method is based on weighing a test portion, dissolution in water, transfer to one of the Nessler colour-comparison cylinders, pipetting the volume of sulfide standard into the second Nessler colour-comparison cylinder, addition of alkaline lead solution, making up with water, mixing thoroughly, and comparing the colour and clarity of the two solutions.