I can only describe it as a very gentle, edge-long dimple parallel to all four edges of the print, less than 1 cm (1/4") from the edge. I can only see it when looking at the print at an angle at which I can see a light reflection along the edge, otherwise it is not visible at all. If you have a look at this thread, http://www.apug.org/forums/forum46/8...-mounting.html, there is a photo of the issue attached to post #4. If you have never experienced it with this paper, I am pleasantly jealous.
Good example, thank you. I can't say that I've ever seen that on my prints, but I will be more aware of it now. I dry mount my prints to acid-free foam core with light pressure and at 195 degrees for 2 minutes. I also use a sheet of butcher paper on top. I don't know if any of what I do makes a difference. I'll definitely be on the lookout for the problem.