I recently found a 1940 print of my uncle by Laura Gilpin in the attic. The print was not stored under ideal conditions. Print may be platinum - about 8 inch by 9 inch. It is in perfect condition. The cardboard mat is about 14 inches and 18 inches. She signed the mat in pencil so I want to perserve it.
As you can see on one of the attached, the vertical edeges of the mat are warped - perhas 1/64 th of an inch. So it is not a great warp but it is visible since it does not lie flat on the photo. The horizontal edges of the mat are perfectly flat.
Does anyone have suggestions for flattening the mat? Can it just put the mat in a hot press and then turn off the heat and let it cool for a couple of hours?
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