Drag artifacts on negatives

[mau]

Hello all,
Some of my negatives display some sort of drag artifact, and I was wondering if you may be able to help me identify the culprit.

I'm attaching an example, both positive and negative.
I have reason to believe that the streaks sometimes run along more than one frame (see the attached image with the red markings).

In the example attached:
Film FP4+ @125
Tank Jobo 1000
Presoaked in water for 2 minutes
Developed in HC-110, dilution 1:31 for 8 minutes. 30 sec initial agitation, and then 5 sec agitation every 30 sec.
Stop bath 15 sec continuous agitation in water.
Fix in Rapid Fixer, dilution 1:4 for 4 minutes. Same agitation as development.
Final wash in running water for 2 minutes and then a final pass in distilled water with Ilford method.

I saw a similar post from 2023 on this forum, but I don't think they ever reached a conclusion, and in any case I think they're missing a piece of info.

I'm pretty sure it's not an issue occurring during the development, but rather I think it happens after, when the negatives are hanging to dry.
The reason is the direction of the streaks. They always run along the length of the negative, which is sitting horizontally during the process.
While it hangs, however, it hangs vertically. And the streaks themselves kinda look like water paths.

I'm thinking perhaps stop in water is not sufficient?
I have stopped using commercial stops because I had some issues with pinholes on the negatives, and apparently stop baths can cause that.
I might try some very diluted acetic acid.

What do you think? Do you agree with my suspicion?

Thanks

 

[MARTIE]

Hello,
I don't think your suspicions. And it might not even be chemical.

Could you tell more about, purchase, expiration, storage before and after exposure and possible x-ray exposure?

 

[mau]

Purchase was sometime last year.
Not sure about expiration, but I do remember I had some rolls very close to it. There's a chance this might have been one of them.
Storage in fridge.
It was indeed exposed to x-rays at the airport, several times. I'd say 4 in total. Good catch.
Edit: however, I do have them on another roll that, as far as I remember, didn't go through x-rays.

 

[loccdor]

I don't see any mention of wetting agent. It looks like drying marks from minerals in the water.

I've tried skipping wetting agent and using a distilled water final wash instead. It didn't work well, I guess there were enough minerals stuck to the film that marks could still be created.

Wetting agent is the way to go.

 

[koraks]

It looks like drying marks from minerals in the water.

This could indeed be the cause.

This kind of pattern I would only expect to result from development if the film was rotary-processed ('wagon rut' unevenness), and that doesn't seem to be the case.

Stop bath 15 sec continuous agitation in water.

That's not really a stop bath. I don't think it's the cause of your problem, though. A stop bath would have to be acidic or at least otherwise act to instantly arrest development. Water works differently; it dilutes the developer so it becomes virtually ineffective. There's a very long thread about whether or not one should use an actual stop bath. I wouldn't worry about it though.

Fix in Rapid Fixer, dilution 1:4 for 4 minutes.

Should be OK for fresh fixer; re-used fixer might be less active and could require a longer fixing time. But again, I don't think this would be the cause of the defect you're seeing.

You could try re-washing the affected film in a dilute acetic acid bath, followed by a wash in preferably demineralized or distilled water. You can add a little surfactant to the final rinse to help the water sheet off of the negatives evenly.

 

[Rick A]

The use of a surfactant mixed with distilled water for final rinse should eliminate the issue. Let your negative soak in the final solution for at least one minute efore hanging to dry. I like to shake the excess water from my film while it's still on the reel then hang, do not squeegee.