Curled film

Developed some 120 film, Ilford Delta 100. I don't recall shooting this film in 120 before now, but after it dried, it seemed very curly, compared to other B&W film I have developed recently. Is this a general characteristic of Delta 100?

I have cut the negatives and sleeved them. I have a heavy book laying on top. Is there a better way to flatten curly film?

I've noticed the same thing last week doing TMax, Delta100 and ORWO all in the same batch. i use foto flo as well. the only roll that just insisted on rolling up on me was the illford.

i wondered if a stronger solution of foto flo might cure the curls?

Run as steamy shower and then hang your film in the shower with a weight on the end. OR put it in a archival negative sheet [PrintFile] and place it under a book for a couple of days.

Just when the film has dried and before scanning, I keep the negative that curls for a day rolled (not tightly, but wide enough to fit) with the emulsion site out in a tupperware. The next day the sit almost completely flat making it easy to scan and store them.