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.
Status: PublishedPublication date: 1992-12
Edition: 1Number of pages: 2
Technical Committee: ISO/TC 42 Photography
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