Photographic emulsions are slightly acidic, and as a consequence, when framing or storing photographs it is recommended that buffered matboards and papers NOT be used. Matboard manufacturers fabricate special non-buffered rag mats for framing, and I am sure that interleafing manufacturers do the same. I have found that lens paper, a lignin-free soft tissue that is available from conservation supply houses like Talas Library Supply in New York, works quite well. But the recommended practice is that those of us responsible for storing and framing photos avoid buffered papers. Good Luck! Oliver Hirsch Hirsch & Associates Fine Art Services, Inc. New York ========================================================= 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).