You were correct Kirk, the mat swelled and then fell apart. So, back to the drawing board. Last night, I had an idea. I went today to the local drug store and picked up a plug of Days O Work Chewing Tobacco. I cut the plugs in half, dipped them in Isopropyl Alcohol and rubbed them onto the print. The alcohol dried quick enough to prevent the mats from coming apart, and carried the color of the tobacco nicely. So, now I have two mats ready for prints to be inserted which look like they have been sitting on a shelf for about 100 yrs. Very cool.