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.