For storing graphic works unframed, we mount our works in acid-free mats, then slip a sheet of acid-free tissue under the top window. Silicon-release Mylar or acid-free glassine is also sometime used instead of the tissue. The Mylar allows visibility without having to lift the mat to remove the slip sheet (but is much more expensive). Regarding the buffered vs. un-buffered question, according to Caring for Your Collections (National Institute for the Conservation of Cultural Property, 1992), p. 73, "Buffered storage enclosures currently are not recommended for contemporary [photographic] color materials, albumen prints, and other 19th century printing processes, including cyanotypes...Buffered materials are recommended, however, for deteriorated film-base negatives, brittle prints, and photographic prints that have been mounted onto poor-quality secondary enclosures." Beverly Balger Registrar, Palmer Museum of Art The Pennsylvania State University University Park, PA 16802 (814) 865-7672 [log in to unmask] ========================================================= 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).