I just bought these fuji superia 400s that are expired since 2007. I opened up some of the canisters and there's a bit of white powdery, flaky stuff on the tops of the rolls....is this some kind of corrosion? or maybe just from friction from the sides of the white canister?
Okay, I got the film developed. Photos look fine with only minor color shift (or maybe that's just me.) But I still have no idea what the white stuff is, only that it has no apparent effect on the photos.