Did 2 rolls of JandC Pro 100 120 film last night. Looked at them (not contacted sheet yet but it appears that I didn't have pinholes. What I do different? I don't know. I think I only presoak (I did them in PMK so I usually presoak) for less than a minute. Maybe that did it.
I only experienced the so-called pinhole problem on their sheet films.. I imagine roll films were manufactured differently. But what I had were not really pinholes, they look more like skid marks. Seemed as if there were fixer on the roller transport or something. So I do think that the pinhole issue is due to excessive stop bath, but am I the only one getting those skid marks on my sheet films? I'll have to test further..
The diabolical thing about J&C Pro 100 is that you might get two rolls without defects, but attributing that fact to your process is virtually impossible. The best that we can do is to follow J&C's guidelines for processing this film, and hope for the best. Good luck.
Jay
I've done at least 20 rolls of 120 j&c 100, and I've never had a problem. However, I use a water stop bath (no acid) with pyrocat-hd semi-stand. I guess I've just been lucky....
I have had missing emulsion on HP5+ though. Once on the entire roll and once just on about 3" of the film. It had to be from something in the production line.
I've had one roll with bubbles that didn't quite perforate into pinholes, and one without a trace of problem (the latter with water rinse in place of acid stop bath, but still my usual acid fixer). I'll know a lot more soon, though; I have three more rolls waiting for development, which I hope to load in tanks today and develop in the next few days. If those, too, are free of problems, then I'll be confident enough to switch to a neutral fixer and use a lot more of this film.
though; I have three more rolls waiting for development, which I hope to load in tanks today and develop in the next few days. If those, too, are free of problems, then I'll be confident enough to switch to a neutral fixer and use a lot more of this film.
I find it encouraging that J&C haven't been able to reproduce the pinholes with their suggested process (though not so encouraging that they don't, as far as I can tell, *tell* us anywhere that they recommend water stop and non-acid fixer to avoid overstressing the gelatin, or even that the film is a soft emulsion, until we come here and complain about the defects). I still haven't got those 3 rolls developed -- though they are loaded in tanks, sitting by the sink, waiting. Probably be able to do them tomorrow -- got too much other stuff demanding my time today.
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