How do you know that was you, the kids and Aunt Mabel on holiday in 1981? Probably by writing on the back of the print. No problem there - until you reach for a ballpoint, felt tip marker pen, or many other nasty devices.
First, the ink can easily permeate the backing material on the print and react with the dyes that make the image. Resulting in staining and unsightly marks on the photos.
Second, the ink can take a very long time to dry. So if that print is put back in the stack the ink can be transfered onto the face of the print above it in the pile. Same result, another print spoiled.
If you must write on the back of a print (and the temptation is probably irresistable) please stick to the humble pencil. Don't reach for a biro or a marker pen.
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