RESTORATION OF A WET PHOTOGRAPH STUCK TO GLASS
A great example of what may happen if a water pipe breaks or a drink spills all over a valuable photograph. While there are many DIY recommendations on how to save a photograph that became wet and stuck to glass, Smithsonian Institute Archive
has a strong warning against such attempts, including putting a photograph into a microwave oven or a freezer, and recommends that restoration of such items should be trusted to professional and experienced photo restoration artist or conservation specialist.
Depending on extent of the damage a photograph can either be separated from the glass with a minimal loss or it can be restored by digital retouching and reproduction of the original.