I'm having the same issue as the OP, and the film hasn't been stored in the fridge. I also have rev 4 holders. It didn't appear when I first started using it, but now after about 40ish sheets, it seems to appear on every negative. I haven't changed my process at all. While it doesn't appear to show in scans, it is concerning. I'm starting to look for other solutions at this point.
Are you pre-soaking the film before development?
I've had similar problems with FP4 which disappeared once i stopped pre-soaking.
Mike
I was using a Jobo, but prefer the Paterson Orbital.
Mike
@grat, I have tried cleaning with alcohol, and I also avoid dunking the holders in photo-flo.
@mpirie, I do pre-soak. I'll try your recommendation on skipping and see what happens.
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