I've used Paraloid (Acryloid in the US) B-72 as a base coat for marking objects, with black or white ink for the numbering, depending on the colour of the object - a method which seems to work well. I got a solution of 50% and then diluted it using acetone to get a suitable consistancy to apply to the object. B-72 is used in conservation treatments and has been tested for its suitability for use with museum objects - it remains soluble in acetone and doesn't yellow or peel. The ink used should be pigment rather than dye based as it is less likely to fade or lose its colour. ========================================================= Important Subscriber Information: The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes). If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).