The aforementioned paper came up in conversation on the Facebook group for this site. I thought it might be useful to post the front & back scan of a quick test I did with a number of pens, starting with "relatively wet" to "relatively average" pens. You'll see why when I use these more affordable notebooks, I only get to use the front side of a sheet. Front: http://i.imgur.com/p2RnHBL.jpg Back: http://i.imgur.com/TZRpzFc.jpg