If you ever get the inkling to put tape onto the back of your pictures to stick down to a piece of paper or anything else, just don't do it. Every once in a while with this business of scanning and photo preservation I get someone's pictures that has had tape on the back. It is the biggest pain to remove and usually sticks so well that the backs of the photos are often damaged during this process. ESPECIALLY on older photos. Also I find that the tape after even a few years starts to yellow and causes a reaction with the photo which in turn damages it in other ways. SO...if you ever have a temptation to put tape any where near your photos, PLEASE PLEASE PLEASE, resist that urge!
Of course if it does happened, or already has happened some of the best tools for removal are metal putty knives, or metal spatulas, or in my case a little tiny pair of scissors for today's work. NONE of these tools should ever need to be near your precious photos!
Ok I have to get back to my photo/tape removal job....