Foma (aka Arista.EDU Ultra) films are also odd in that the 35mm variety has a clear/gray base and poor anti-halation characteristics, whereas the MF variety has a blue base and much better anti-halation characteristics. I'm not sure what the story is there, but it could well have something to do with the lack of curl in 35mm vs. substantial curl in MF to which Bobby refers.
Foma (aka Arista.EDU Ultra) films are also odd in that the 35mm variety has a clear/gray base and poor anti-halation characteristics, whereas the MF variety has a blue base and much better anti-halation characteristics. I'm not sure what the story is there, but it could well have something to do with the lack of curl in 35mm vs. substantial curl in MF to which Bobby refers.