Puzzling result

The other day I decided to do some shooting. Three rolls of Delta 400 120 " A B C." All taken with the same camera Hasselblad c/m 500. All the film was fresh exp 2022, boxed and in the sealed wrapping. After finishing roll A, I opened roll B and shot it. Then roll C but only exposed 6 frames. I developed A and B in the same tank with Ilfotec dd-x. After processing and washing I found roll B to be fogged and have what appeared to be a major light seal failure. I placed black tape over the dark-slide port and exposed two frames + two with the lens cap in place and rewound the last two with roll C that already had six frames exposed. I developed roll C and it came out perfect. To double check, I took a forth roll D. Same camera, no tape, one frame with each of five different lenses and one with the 2x + 150mm lens, two frames with the lens cap on and rewound the rest. Roll D came out perfect. I did not insert the dark slide at all with any of the rolls before, during or after.

What happened to roll B ? Factory mess up, dealer mess up ( it was purchased with nine other rolls and sent as a brick ), Murphy's law.? I've been doing my own for fifty years and have never run into something like this. Fortunately they were nothing I can't take again.

It can't be the light seal. I am lost for an explanation. I know it was not in loading the film since it was on the entire roll and there was a triangular area of more exposure on each frame all on the same side and the photographs were taken in different locations miles apart and under different light conditions with some indoors and some outside. Any ideas?

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Cell phone waking up while you were loading the film onto the reel?

Cell phone was not near at all

Still, I'd suggest that the fogged roll got fogged either during loading or in the tank. Lid not fully closed, core left out of the tank, fluorescent overhead lights with afterglow, etc. It's the simplest explanation why the rolls before and after were okay and only that one has fogging and light leak marks.

Donald,

I loaded both rolls one after another, the lid was tight and both rolls were in the same tank at the same time. The tank is a Kinderman stainless steel holding two 120 rolls at a time. I have a dedicated darkroom in my house and have been developing and printing in this darkroom since 1976. I am aware of afterglow and always wait a while if I turn on the overhead lights. It was major fogging. The roll in question was fogged on every frame. I understand your reasoning but nothing was done differently than I always do. The third roll was developed the same day and the forth today.

That is strange! Were the apparent light leaks on roll B on the darkslide side of the frames (left side of the camera, right side of the image)? If you post a quick phone photo of the negatives, it might help with attempts at distance diagnosis.

Can you go into a bit more detail regarding the fogging? Is image matter still visible? Is the fogging uniform? Does the fogging go across frame borders?

I would say the least likely source of fogging is "bad luck pre-fogged a single roll". It's got to have something to do with the handling somewhere in the chain of events after the box/envelope was opened. With some technical input from your side we may figure it out.

Is it possible the film back was not 100% latched? Sounds like the kind of fog that can happen through a hairline crack (doesn't blacken the film, all the film is fogged).

If the fogging occurs in all frames in the same location on each frame, the fogging most likely occurred while the film was in the camera. The way film is wound onto rolls and reels produces radii of increasing length as you move from inside to outside and any leak at that point would not be in the same spot on each frame.

Fat roll? That would/could fog both edges, and some into the frames, but less toward the center (usually) and little in the interframe space.

Bummer, that this happened. Photos of the result would sure help figure it out.