mixed stop bath and fixer

bunip · Feb 21, 2022

While film developing in a jobo tank i mixed stop bath (citric acid) and fixer (tetenal superfix plus) 1:1. After the xtol-r bath, I used for 1 minute the stop-fix mixture and then fixed with a fresh fixer. Negatives (3x120 acros 100) inspected while washing looks like normal. Do you think I could feuse that mixture as stop?
thanks

Donald Qualls · Feb 21, 2022

The only reasons I'm aware of not to go directly from developer to fixer are fixer longevity (acid fixers will gradually lose their acidity) and the potential of fogging if the pH gets high enough for development to continue with the developer absorbed into the emulsion (thiosulfate is a weak foggant). Given your stop bath is acidic enough to stop development promptly, I don't know any reason you couldn't reuse it. Then again, there's nothing gained, as far as I can see, by doing this...

markbau · Feb 21, 2022

Why are you adding fixer to your stop bath? Keep it simple, for a stop bath I just use a few changes of water. For film 1 litre of film strength fixer will do about 20 rolls of film.

bunip · Feb 21, 2022

mixing was a mistake

bunip · Feb 21, 2022

thanks Donald. I developed another 3x120 tank with the same mix as stop and the results were fine. hope not to rysk on long term durability

Donald Qualls · Feb 21, 2022

If your stop bath has an indicator, you should be okay using it until the indicator turns purple (showing pH too low to stop development promptly). If not, stop bath is cheap...

bunip · Feb 21, 2022

Yes sure. My stop is citric acid 25g/H2Oliter; my question was just to end my session without stopping for mixing new. Now I see results are fine, but for the next session will mix new stop.
thanks again

mixed stop bath and fixer

bunip

Donald Qualls

markbau

bunip

bunip

Donald Qualls

bunip

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