Definitely, using just A or B leads to some loss of speed, but it's not bad at all. Will try this approach with developing a bit contrasty ORWO DP-31 double positive film.
Mixing A and B in batches of 2 or 3 liters will be ideal for me, if T2B is my main developer. That way I can use it with 5 reels tank. What also surprised me is how "muddy" bath A was after 8 rolls? It left nice layer of fine gray deposits on filter paper. It was also hard to clean walls of glass bottle from deposits from Bath B. Maybe I need better brush?
So far I used T2B with Kentmere 100, Ilford Pan F, Fuji Acros and Kodak Verichrome (expired in 1969) and Plus X and I'm happy with results.
I instead have made up a concentrate in propylene glycol that contains just the developing agents in the ratio that I like. This will enable testing various formulas without having to measure out and mess with measuring more phenidone and ensures that this ratio is the same all the time.
I'm on the "fence" regarding moving to Vitamine C-Phenidone version of bath A.
Any good source of Ascorbic Acid in Vancouver, BC? Brand?
That was easy! Thank you Karl! Now my excuses become much thinner!
Any recommendation what recipe to try first?
This morning I mixed new batch of B for T2B. It's usually time to mix A too but...
Will keep used and "seasoned" B, for a few more tests.
So far, I can not see parts of A being just neutralised in B after "some time". I was not using T2B every day but more like a week apart. Maybe B needs to be much stronger for that to happen?
This is interesting, I am posting only because it might be interesting to attempt to preserve an ascorbic acid developer in acidic conditions, probably a little more acidic than 2B-4.
That of course is a time-honored method for preserving two-part developers.
However, I remember reading that the acidic environment is not effective for preserving ascorbate developers. Maybe it was a Ryuji Suzuki article. I'll have a look at my downloaded articles, maybe there's something there.
Thanks, yes, though acidic first baths in a two bath developers don’t work very well in general. (Actually Ryuji mentioned that in your link). The only reason 2B-4 worked was because of the carryover 20ml of bath A. Which also ruins bath B as discussed earlier in this thread.
Anyway, I thought that this was interesting in the context that 2B-4 is an ascorbic acid developer and being acidic has somewhat preserved it over nearly two years. With tap water. I did use etidronic acid but that’s not even very effective with ascorbic acid. So I think there might be something more to it. At least it’s a data point that may be of future note.
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