Expired film is one of the more unpredictable variables in film photography, and knowing how to handle it can mean the difference between a roll worth keeping and one that goes straight in the bin. The rules aren't complicated, but they're easy to get wrong, especially when you're buying film with an unknown history.
Coming to you from Hashem Moukaddem of Pushing Film, this practical video covers what actually happens to film as it ages and what you can do about it. Moukaddem walks through a recent roll of Kodak Gold 400 that came back nearly unusable, shot on a point and shoot that only allowed one stop of exposure compensation. The problem: the roll was more than 20 years old, and the general guideline is to overexpose by one stop for every 10 years expired. With a high-speed consumer stock that old, he needed two or three stops, not one. The camera simply couldn't get there.
The storage history of a roll matters as much as its age. Moukaddem explains that cold storage, whether in a fridge or freezer, extends a roll's usable life significantly, much like refrigerating food past its use-by date. He's shot a roll from 1975 that came back with surprisingly good results because it had been well stored. On the other end, a roll gifted to him with no known storage history came back looking rough despite being the same age as other rolls that turned out fine. He also flags heat, humidity, and X-rays from checked baggage as real threats to unexposed film, and recommends keeping film in an airtight bag or container if it's going in the freezer.
The overexposure rule applies differently depending on the film type. Black and white negative film handles overexposure well, so following the same one-stop-per-decade rule is reasonable, with some adjustment for film speed. Slow films like Ilford Pan F Plus 50 might only need a stop every 15 years. Slide film is a different story entirely. Rather than losing sensitivity the way negative film does, expired slide film tends to color shift in ways that overexposure won't fix. Moukaddem describes shooting expired Fujifilm Velvia 50 that came back with an extreme purple cast, and Agfa CT 100 slides that went yellow-green. With slide film, if you expose at all beyond box speed, keep it to a third of a stop at most. The video also covers what he is planning to shoot next: a roll of Fujifilm Provia 400X slide film of unknown storage history, loaded into a Leica MA for street shooting. He's going in with low expectations and a mindset of just having fun with it, which is probably the right approach when you don't know what a roll has been through. Check out the video above for the full rundown from Moukaddem.
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