Photography -- Photographic-grade chemicals -- Test methods -- Part 7: Determination of alkalinity or acidity
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This standard was last reviewed* in 2013.
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.
Document published on: 1992-12-30 Edition: 1 (Monolingual) ICS: 37.040.30 Status: Published Stage: 90.93 (2013-06-27) TC/SC: ISO/TC 42 Number of Pages: 2
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