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
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