I just ran across a blog from quiltingclimber.blogspot.com/2011/07/frixion-pens-evaluated.html very complex evaluation done on a quilt sandwich. Everyone should read it before they use these pens on anything of high value or very light colored fabric. I was all set to buy the pens until I found this. I know not too many people will put their quilts in the refrigerator, but the cold weather use of quilts, especially outdoors (or even gift wrapped on it's way to a friend/client house in winter) is enough to steer me clear of these. Just saying....