Analog film photography and cameras

I worked in a high street lab for a long time, and this looks distinctly like roller damage to me – the rollers in a lot of industrial C41 machines get progressively harder as the film moves through the machine, with the last being a rock hard rubber squeegey (sp?) before the film goes through the drying chamber. These squeegeys (sp?) are usually rinsed daily, but are often not. When not, they accumulate chemical build ups that cause the the wrinkle and perish, often leaving uniform areas of wetness or chemically smearing on films...

In short, change labs!

I had same idea when I was brushing my teeth! I don't ever remember being asked to clean the rollers to be honest. That would explain much. exactly as you say, now I think about it, the ones closer to the dryer were slightly marked and cracked. Sorta like a really
Old tyre that's been left out too long.

Moar crack den mattresses please! The double stack is fascinating. Reckon they're spotless underneath? You should jump on them