Xray film hand rolled onto 120 backing paper: Kodak paper specifically is completely ruining the rolls but not ilford etc?

MattKing said:

And how long has that re-rolled film spent in warehouses, shipping trucks/boats/trains, on retailer shelves and in your film storage?
Under what range of temperature and humidity conditions?
Someone doing this with the intention that they will keep the results carefully and use it and develop it promptly has to deal with far fewer variables than the film manufacturers do.

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They've been through the wringer. Whatever conditions my handrolled film has been through it. Stress tested and whatever else you can throw at it. I've had issues but not from the backing paper so far. I'm no film wizard, and my knowledge falls short of a lot of users here but I do know I'm one of the few people that hand slits and rolls their 120 film. That's one process I have vastly more experience in than most. I even got some tips from former Kodak workers back when I worked on the Kodak campus over a decade ago. Unless you're dealing with high heat and/or humidity the backing paper is generally not the failure point. Humidity seems to be the main killer in my experience. Worse than heat or even light leaks.

Keep your hand rolled 120 film dry and cool and it should be fine.

MattKing said:

Isn't this your main issue?

I'm confused why it is that you can't see that each and all of the out of spec variables you are throwing at the wall here are part of "what is going on here".
All the backing papers and all the films are designed with each other in mind, as well as the intended uses and processes that they are matched to.
So when you make big changes, you can expect them all to respond unpredictably, in different ways.

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Because each and every one of those was irrelevant for ilford paper. So none of them can possibly be an independent cause.

They can form part of an interaction effect, but any interaction effect here by necessity must also be reliant on something unique to kodak paper that ilford doesn't use.

I was mainly hoping it was just common knowledge what the glossy stuff on kodak paper WAS, basically, which might have reveealed other options or solutions or ideas beyond "jsust use ilford the end". But it seems like it's all secret or proprietary, or at least just nobody here knows exactly what the difference between the two is. So *shrug* that's cool.

Crimeo said:

Because each and every one of those was irrelevant for ilford paper. So none of them can possibly be an independent cause.

They can form part of an interaction effect, but any interaction effect here by necessity must also be reliant on something unique to kodak paper that ilford doesn't use.

I was mainly hoping it was just common knowledge what the glossy stuff on kodak paper WAS, basically, which might have reveealed other options or solutions or ideas beyond "jsust use ilford the end". But it seems like it's all secret or proprietary, or at least just nobody here knows exactly what the difference between the two is. So *shrug* that's cool.

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I mean, I hate to be this guy, but yeah, it is pretty secret and proprietary, Kodak, Ilford, Fuji, Foma, all have their own paper, they know what works, and they aren’t gonna share it because it is an integral part of their film.

There is no way that you’re going to be able to test for every single variable to see what the difference exactly is, even Kodak and Ilford struggle with that, and they have a lot more R&D money than you. If you find something that works, use what works. If you find something that doesn’t work, don’t use it.

The OP was asking in theory WHY some and not others, but for them rolling green ds Xray film, they only need to use the one that works, Ilford. I would think possible to load some roll film cameras using a red safelight without backing paper provided film advance is automatic and no little red window and camera is loaded and unloaded in darkroom. Also might be possible to fog a roll of film, develop and fix, and use that as a backing material provided not too think. Be creative. Experiment. Think.