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Dry-mounting worries
Laura,
I have had the same concerns (valid) that you have had. I was very surprised when the curators in the drawing and photography department of the RISD museum informed me that they had seen no deleterious effect on photographs that had been dry-mounted. And if I remember correctly it was a considerable time frame they were talking about.
I told them I wanted to dry-mount finished pastels or simply pastel paper, they said if it was done properly with the proper materials, they could not see the disadvantage. There are different dry-mounting materials available today, some say they are archival. At the time I was inquiring about mounting over sized work which is very difficult to do by oneself. I think the best thing to do is to inquire of a local museum and see what their take is on it. Apparently it varies.
I had a valuable rare signed Picasso lithograph damaged from an improper mat and backing that was not acid free, so the concern is not trivial.
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