Before I dispose of them, I thought I would ask the question. I have a bunch of Cibachrome-A chems that I received a bulk lot recently. While the boxes have deteriorated, the chems are still in sealed foil packets. I am not sure of the vintage, but I would has it a guess that they are +20 years old.

Do you know whether these would be of any use? Or would it best be to dispose of them?