I am getting overdevelopment or high edge density on the film edge opposite the notch. This is the 7 inch side of 7x17 film. The other three edges are fine. Can you offer suggestions how to eliminate this problem?
I am using 7x17 HP5+ film, Rollo Pyro developer from Bostick & Sullivan. I develop two sheets at a time of the same image bracketed 2 stops. The notched edge is always loaded at the top or lid end of either of two 2800 series drums. Emulsion faces to the center of the tank. The problem happens in either drum. I have ten film holders and the problem exists which ever film holder I use so I doubt it is a light leak. The higher density is roughly ¼ inch to 3/16ths”. Some times I can burn it out in printing with approximately 100% burning time or twice what it takes for the rest of the print.
I have been using Rollo Pyro for at least five years, but this seems to be a recent problem.
I am using a Jobo CPP-2 serial # 13391. I use a five minute prewash with the sodium metabolite that comes in the Rollo Pyro kit. This is ¼ teaspoon in 500 ml water. The water is 70 degrees F or 21.1 C. Development time is 6 minutes. In an experiment to reduce agitation I have been decreasing the rotation speed from 4, to 3, to F to the first notch beyond F. This seems to have made the problem worse.
Any help appreciated. Ask if you have questions.
Thanks,
John Powers
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