I was told today during a guild meeting that the ink markings would reappear if the item was chilled. Put a smaill block in the freezer for about 2 hours (forgot about it until after dinner out), and sure enough, the mark that had disappeared had returned. Magic!!! Another later post says that if the item is washed, it will not come back. Haven't checked that yet, but the chilling does result in return of markings. Now, my question, if I don't store my quilts in the freezer, or plan to get stranded on the interstate during a blizzard, is this really a problem? That's a judgement call. For me, I plan to mark a block in some freehand fashion, press it and have it disappear, and then wash the puppy. Never hurts to be safe.