I have read of film photographers distressing negatives by damaging developed film in all sorts of ways with heat, water, chemicals and physical damage. The results can be fascinating and surprising.
I thought I would try and alter the outcome of a film by distressing 120 film before exposure, so I removed most of the lead backing paper of a roll of Kentmere 100 before dunking it in hot water and then blasting it with a heat gun.
Then I reattached the backing paper with masking tape and exposed it still damp in an Ensign Selfix 20.
The results remind me of glass plate images.