I have started experimenting with the Pilot Frixion ball erasable gel pen (phew ... that's all on the package!) Anyway, not only is it erasable ... it is thermo-sensitive. Passing a warm iron over it also makes it go away. So far I have only used it on the back side or the fabric and it DOES go away with the heat of the iron. The package I have comes with ried, blue and black pens. As an aside, I also do like the fine line it makes.