Since a while I am developing my slides and that's very, very nice. I preserve my slides in stripes of 6 pictures each, using translucent paper sheets which are supposed to be good for long-term preservation. Those are sheets of that special translucent paper, not really transparent at all, I don't know the name in English* (we call them pergamini). To be exact, I use the sheets #2510 in the Kaiser catalogue (this is the number of the 100 sheets package, the 25 sheets package is catalogued with number #2515). I read now on an Italian forum that substances used to make the paper "transparent" might pose a risk for long-term preservation of the film. Knowing the vastness and depth of the knowledge available in this forum, I'd like to pose a few questions: - Are translucent paper sheets really dangerous for film? - Were all translucent papers created equal, or is there the bad, the good and the ugly? - What about Kaiser #2510 specifically? - If my sheets are not advisable for the long term, what should I buy? Which kind of plastic exactly? And which maker, model? I know anything containing PVC is to be avoided, but it's not easy to know the material sometime. Thanks Fabrizio * EDIT: This is what I use: http://www.kaiser-fototechnik.de/en/produkte/2_1_produktanzeige.asp?nr=2510 It seems the material used is called "glassine".