My question is like this one, but only more so. My photos have been in the envelope for more than 30 years. I tried water, then steam, then turpentine, none of which worked. These are BW silver oxide photos on Kodak paper. Any ideas?
A similar question has a full and detailed answer over on Photo.SE.
This post states that you need to keep the pictures humid for an extended period.
In my experience, soaking the photos in a bath or water for at least 12 hours will separate them. The pictures can then be carefully dried after you have carefully peeled them apart.