Photography — Photographic-grade chemicals — Test methods — Part 7: Determination of alkalinity or acidity
NORMA vydaná dňa 30.12.1992
Označenie normy: ISO 10349-7:1992
Dátum vydania normy: 30.12.1992
Počet strán: 2
Približná hmotnosť: 6 g (0.01 libier)
Krajina: Medzinárodná technická norma
Kategória: Technické normy 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.