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ISO 10349-7:1992 Photography -- Photographic-grade chemicals -- Test methods -- Part 7: Determination of alkalinity or acidity
standard by International Organization for Standardization, 12/01/1992
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The method is based on weighing the test portion, dissolution in carbon-dioxide-free water, adding phenolphthalein indicator, and observing the colour of the test solution: if the test solution turns pink, determination of the alkalinity, if it remains colourless, determination of the acidity.