Are the edge markings on the film as faint as the image? If they look normal, it's an exposure problem, not a development problem.
It might also be a case of "Pyrocat sudden death". Have you developed any other film in your batch of Pyrocat since you started using Delta 3200?
IIRC, there was at least one case where it was an alleged "sudden death" and the same chemicals performed fine the next time. In any case, Pyrocat HD isn't exactly a speed increasing, or even maintaining developer as far as I can tell. Seemed to give HP5+ an effective ISO200 in my tests, while Xtol gave a bit over 400. There are IMHO better choices for push processing developers.The sudden death thing has only happened with store bought, as far as I know.
IIRC, there was at least one case where it was an alleged "sudden death" and the same chemicals performed fine the next time. In any case, Pyrocat HD isn't exactly a speed increasing, or even maintaining developer as far as I can tell. Seemed to give HP5+ an effective ISO200 in my tests, while Xtol gave a bit over 400. There are IMHO better choices for push processing developers.
Pyrocat HD isn't exactly a speed increasing, or even maintaining developer as far as I can tell. Seemed to give HP5+ an effective ISO200 in my tests,
That's not right. Either you underexposed, or something went wrong with the developer (mixing error or sudden death). Pyrocat & Delta3200 should give more contrast with the parameters you listed. It's maybe not the best combination, but it does work, and better than you observed.Next 2 rolls I shot at 1200 and developed 24min, with initial 1min constant and then 4 inversions every 2 min (same as I do for a +1 push of HP5). These did create a discernable image, but with a DMax in the 0.5-0.6 range, which combined with the very high Fb+F (at least compared to the Ilford films I'm used to) gave me a maximum DR of ~0.3-0.4, barely suitable for a grade 5 print and only on a few shots, at that.
I have made the observation, that Delta 3200 needs a lot more developer than other films. If you look at instructions for liquid film developer concentrates, quite often higher concentrations are listed for Delta 3200 than for other film. I have the impression, that Delta 3200 releases massive amounts of iodide during development. This released iodide strongly restrains high density areas, while allowing weakly exposed areas to fully develop. The result is a high speed rating and great pushability without runaway highlights. At the same time it makes this particular film very unsuitable for dilute developers.
And of all developers tested, Atomal is the one giving the best speed.Here is a comparison of some developers for Delta 3200.
The tester tried to create normal contrast in the lower part of the H&D curve, which is not the correct mode of operation for this film.
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