Buy Ilford, Kodak or Fuji film. You are paying a little extra for curl reduction chemistry!
PE
If there was Arista Premium in 120 I would go buy a few bricks. Alas, no...
Curl and all?
PE
Well, if the curl makes the film look like a long tube or pipe, we call it "Piping". If the film curls like a yo-yo would go up and down, then we call it a "Set". The latter is almost always caused by having old film in rolls too long and the former is due to the shrinkage of the emulsion with respect to swell of the base. The piping is often caused by lack of a back coat, or the use of poorly conditioned (many steps take place here) support.
Some types of curl can be caused by the drying conditions of the emulsion during manufacture.
All types can be either controlled or eliminated by chemistry or methods in use by Ilford, Kodak and Fuji.
PE
Tri-X has been piping bad for me, it always does in winter here because of the very low humidity. In summer, which is usually pretty humid in Indiana, my Tri-X dries flat.
I just processed a roll of 35mm Arista Premium 400 and mine also had tons of curl. After I cut and sleeved it I set a couple of my wife's engineering text books on it. After a couple of days they were flatter, but still curled a little bit.
Adam
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