Tom Kershaw
Subscriber
I wonder if it's possibly some sort of microscopic variance in the film width which causes tiny abrasions at some stage in manufacture or exposure, then exposure to the process chemistry loosens it from the base?
I have wondered this as well, as I have thought I've seen some width variation (with HP5 Plus) but may have been imagining things. I have seen serious width variation with Maco's 'Rollei' brand films to the extent I will no longer use their products, so this is evidently a possible manufacturing issue with '120' film. One feature I have noticed is that Kodak T-Max film printed info on the top and bottom, eg. TMY-2 etc. is always positioned on the same part of the film strip, whereas the Harman version 'ILFORD FP4 PLUS' et al varies in location relative to the edge of the film; perhaps they need to look at the alignment of their '120' confectioning machinery.