I agree that it is probably better to do nothing. One frame (the train photo) had a crack in the glass for several decades, causing some discoloration in the smoggy air of Los Angeles. Amazingly enough, the discoloration is gone after 30 years of being behind a whole piece of glass. The paper is slightly wavey where the crack was.
I want to re-mat them (it has been perhaps 20+ years since I did it last. I want to use a warmer mat board (8-ply, antique white) and replace the piece of buffered board I put on the back (behind the original acid board) -- just to improve the general pH of the package.
Vaughn
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