I recently started printing my own images. Sometimes I find that I want to associate some information with a print, the most obvious being the print date. I've found myself with multiple copies of the same image and trying to determine which one was the last one I printed. I don't want to do anything that adversely affects the print. In ancient days, the advice was to write with pencil on the back. Obviously, one would have to be careful to not dent the image when doing this. I just tried it on one of the inkjet photo papers I have and the pencil barely registered. Ink seems like it would be damaging. Maybe there are some stickers with archival-quality glue? I don't know, maybe I'm the only one with this problem. I'm sure a lot of people only print one of anything, so it wouldn't be an issue. Suggestions welcome.