I have Pan F and Plus X from the mid 70's, 35mm in 100 foot rolls, just defrosted, no fog but loss of speed, about a stop. I shoot the Pan F at 12 the Plus X at 50.
I've had paper frozen for 30+ years, but not film - only refrigerated. The paper kept well (Kodak Panalure & Ektalure - now Forte). Film on the other hand, I believe, is more sensitive to cosmic radiation (passes through everything, including the earth, and us).
Early particle physics experiments were done with Ilford monochrome film for detecting telltale tracks of cosmic radiation, perhaps "neutrinos".
I have some super XX from 1991 that is plenty good with little base fog.
Same source as well?
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