I disagree. In my experience, moderately outdated b/w films work just fine. Unlike color stock, b/w film doesn't immediately drift seriously from its original recording ability. If it's less than five years outdated, I wouldn't hesitate to use it (though perhaps not for a particularly important subject.) If it's more than five years outdated, there will be some speed loss and perhaps some fog... And if it's more than ten years outdated, it's probably not worth using.(posted 9243 days ago)Caveat: I don't have any experience with outdated TMZ - I'm talking about PX and TX here. It may well be that this ultra-high-speed emulsion decays much faster than old-tech films once it passes its expiration date. Still, if it's only three years outdated, I'd find a less-than-critical application and use it. You might want to rate it a half-stop or stop slower than normal to be on the safe side...