John Sonewald , Aug 08, 2001; 03:57 p.m.
Porters (www.porters.com) sells stamps, ink, ink solvent, and ink pads for this purpose. The real secret is the ink, which is super fast drying. You use it with standard style (NOT self-inking) stamps, and a stamp pad that is purchased un-inked. The ink can be removed without a trace from the photos with the solvent. Because the ink is so fast drying, the ink pad tends to dry while you are using it. Adding solvent revives it and is better than adding more ink every time.