"scratchy" dry marks after switching to FX-39 + TF-4

[ChrisBCS]

A few notes: I use laboratory grade RO/DI water for all processing steps, start to finish. I also use photo-flo in this water for final soak before drying, a few drops per half liter.

Here's a kicker: I just looked at rolls developed using ID-11 + Ilford Rapid Fixer and these marks are absent.

The rolls that exhibit them were ALL developed in FX-39 and fixed with TF-4, and actually come from BOTH of my Hasselblad backs, an A12 and C12. I don't have any processed using this combo that are free of the marks.

Two films have been affected: Ilford Delta 100 Pro and Ilford Pan F plus 50.

Any thoughts on this chemistry and why the marks?

 

[John Wiegerink]

Do you wipe your film after hanging?

 

[ChrisBCS]

No, no wiping or squeegee. The marks randomly start and stop and aren't paired like the sides of drips. My wondering is if this is some chemical crazing of some sort.

 

[Michael Guzzi]

I'm no expert, far from it, but that looks like some sort of mechanical stress. See how the emulsion seems to have "chipped off" on the right. Could be some processing/handling issue. Did you notice any particles floating inside any of the solutions during developing?

Or maybe, your combination of chemistry causes the emulsion to swell/contract abruptly, causing the marks. But I'm no expert on that either.

 

[Alan9940]

This looks like some sort of physical abrasion. I've used quite a bit of FX-39 and TF-4/TF-5 in the past and never had any issues with that combination. Sorry, I know that doesn't help...these kinds of problems are always a bugger to figure out.