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
Publicado
(Edición 1, 1992)
Esta publicación se revisó y confirmó por última vez en 2023.
Por lo tanto, esta versión es la actual.
Resumen
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.