Photography — Photographic-grade chemicals — Test methods — Part 7: Determination of alkalinity or acidity
NORM herausgegeben am 30.12.1992
Designation standards: ISO 10349-7:1992
Publication date standards: 30.12.1992
The number of pages: 2
Approximate weight : 6 g (0.01 lbs)
Country: International technical standard
Kategorie: Technische Normen ISO
Description / Abstract: 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.