STOP!
Be sure that the diploma is NOT done on sheepskin or other animal type skin.
Any steaming of it will cause irreversable wrinkling, shrinkage & damage. I
suspect that it Was done on some type of animal skin (and moisture has
probably caused the initial wrinkling.)
We had a Dr. diploma c. 1910s, and it was done on sheepskin. (I found that
out by accidentally using some moisture activated adhesive when mounting it.
Fortunately it only affected a small area covered by the matt.) I suggest
you just try to gently unroll it and flatten it with weights before matting
& framing.
Good Luck
Susan Cooper Finney
Exhibit Designer
Michigan Historical Museum
717 W. Allegan St.
Lansing, MI 48909-8240
517-373-4859
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