Reference number
ISO 10349-7:1992
ISO 10349-7:1992
© ISO 2024
International Standard
ISO 10349-7:1992
Photography — Photographic-grade chemicals — Test methods — Part 7: Determination of alkalinity or acidity
Edition 1
1992-12
1992-12
ISO 10349-7:1992
21264
Published
(Edition 1, 1992)
This publication was last reviewed and confirmed in 2023.
Therefore this version remains current.
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.