Nina, I am sure you would not want to experiment and potentially ruin the item by using the wrong product or technique. I would consult with a member of the AIC, The American Institute for Conservation of Historic and Artistic Works, 1717 K Street, NW, Suite 301 Washington, DC 20006. I was a member of AIC for a number of years, they are very helpful and extremely knowledgable. Regards, Nicola Linza CDP Cultural Disaster Protection supporting cultural disaster prevention, response, and recovery. http://groups.yahoo.com/group/CulturalDisasterProtection ========================================================= 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).