If you’ve been around long enough to be printing photos, and even longer to be storing them in shoe boxes, you must have had that frustrating experience when two (or more) photos got stuck together. It feels as if there were super-glued and any attempt to apply force to separate them will result in damaging the photos.
wikiHow shares a great tip to separate those photos, simply soak them in warm water:
Soak any that are stuck together. Water will not harm most photographs, as exposure to water is actually part of the chemical development process for conventional photographs. If photographs have stuck together: soak the photographs for at least an hour in lukewarm water. Gently peel apart.
To dry those photos off wikiHow recommends either hanging them on a cloth-line or (if that is not an option), lay them down flat on a piece of cloth or paper towel to dry peacefully.