Well I have several rolls of HP3 120 roll film that was exposed in 1952 and never developed! I did a clip test on one roll and managed to pull two images off the whole thing. It was badly fogged, the backing paper had merged with the film and had to be coaxed off, and I think it had caused a lot of chemical fogging. I will probably post a thread in the b&w section seeking ideas on how best to develop the other rolls. I also have some exposed, undeveloped glass plates from the same era.