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

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