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Status : Active
Standard Type : Main
Document No : ISO 10349-7:1992
Document Year : 1992
Pages : 2
Edition : 1
Section Volume : Photography (ISO/TC 42.)
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.