Processing error? Fogging?

I developed a roll of Delta 100 today and I have dark bands down the middle of the film. Looking between the frames, they move toward the bottom 1/3 of the film width and mostly end by frame 15. A small amount is visible at frame 24 ( it was a 24 exp roll).

Any idea what happened? Developer was pyrocat HD in a Jobo tank. Camera is a Nikon F6. It doesn't look like a light leak past the shutter, and I've never had fogging issues in the darkroom before. Leaky felt lips on the cassette? It was loaded and unloaded inside in quite subdued light. I would have thought a light leak would fog the film equally.

Ideas welcome!

It is hard to see, but I would bet on incomplete fixing.
Try re-fixing in fresh fixer.

Insufficient fixing.

The double steaks? Kinda weird. Delta and Kodak T grain films eat fixer that's for sure. I fix T grain film for at least 5 minutes with constant agitation in fresh Kodak rapid fix. Sure enough I would try fresh fixer and vigorous agitation.
Mike

17 Nov 2017

Craig:

As Matt and Old-and-Feebl hav said. Try re-fixing, wash, and PhotoFlo.

Regards,
Darwin

You all were correct, refixing cleared it. Odd to me, it sure looked like exposure, rather than insufficient fix. This is the first time I have experienced incomplete fixing in the Jobo, I'll have to keep an eye out for that in the future.

I always expect extended fixing times with T Max, bit not with Ilford films.

Craig said:

You all were correct, refixing cleared it. Odd to me, it sure looked like exposure, rather than insufficient fix. This is the first time I have experienced incomplete fixing in the Jobo, I'll have to keep an eye out for that in the future.

I always expect extended fixing times with T Max, bit not with Ilford films.

Click to expand...

I have used TMY for a long time, Delta is Ilford's version of tabular grain. Lately I've started shooting more Ilford FP 4 and HP 5. It will clear in 30 seconds. Two minutes is all it needs .This is how I remember Plus-X etc.
I am really bugged by the purple left in TMY. My solution is Kodak hypo clearing agent for 2 minutes after fix. I'm doing all this on a Jobo. This a good reminder for me to watch for exhausted fixer. Good lesson.
Best Mike

MattKing said:

It is hard to see, but I would bet on incomplete fixing.
Try re-fixing in fresh fixer.

Click to expand...

+1 The center of the film is the last to fix so this mark is indicative of improper fixing. This problem is often shown in beginner HOWTO books.