The conservation list would give you the latest methods and pros and cons regarding cleaning marble. The following is the info I have on subscribing: Mail submissions to [log in to unmask] Administrative matters (file requests, subscription requests, etc) to [log in to unmask] DistList Archives: All instances of the DistList are available (both for browsing by whole items and searching for individual messages): http://palimpsest.stanford.edu/ The ConsDir is available at the same site. ========================================================= 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).