Let me reinforce the idea of an isolating coat under the number, which is what makes the marking removable. I currently use an acetate layer known as "Soluvar". I believe it is available in art supply stores. Also, check out Dudley, "Registration Methods" for basic numbering guidelines. _________________________________________ Miriam Albahari [log in to unmask] registrar, Jewish Historical Society of Maryland "Miracles sometimes occur, but one has to work terribly hard for them." -Chaim Weizmann > on the technicalities, but basically, nail polish has lots of extra > nasty things in it that really arent good for objects. I _believe_ > (dont flame me if i get this mixed up :) ) that our museum's anthro > department uses PVA in acetone for this purpose. Its the same basic > ingredients without all the nasties that are in nail polish. > Oh, and one more thing, put a layer of this mixture under the number > as well as on top of it, this lets the number be removed or changed > much more easily. Reversibility, reversibility, reversibility :) > > Vanda Bushfield > Grad Student > Texas Tech University >