Does anyone have an explanation as to the cause of the patterns in the accompanying image. These three frames are from the end of a 12 exposure sequence on Ilford Delta 400 that was loaded in a darkroom and processed in Jobo CPP-2 processor with HC-110, dil B.
The first 7 exposures on this roll are good. This pattern has never appeared on any other roll I have exposed and processed.
X-ray comes to mind, but this film has not gone through a security checkpoint since it has been in my posession. Had it been x-rayed prior to prior to purchase, then the question would be: how did the interior frames get exposed without the exterior frames becoming exposed as well.
Furthermore, the pattern appears to be continuous all the way around the roll. I would expect the x-ray to penetrate toward the center and diminish on the far side.
This in my mind rules out x-rays. But then what could cause this problem?
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