Beacon Fabric & Notions has lots of ways to mark fabric.
Gel Pilot Frixion Erasable Pens for quilting and sewing. Gel Marker Pen for Fabric
Frixion Ball Pen-Fine Point
Also see Markers
Back to Sewing Notions
These Ball point gel pens have a Thermo-Sensitive ink formula that disappears with erasing friction on paper. But what makes them great to use on fabric? Not only do they write smoothly, the ink will not smear. It will not wash off or rub off while you need it. This amazing pen's mark is removable by heat, such as an iron. The Frixon fabric marker pens are great for marking quilt tops or red work. When done stitching, press your fabric, with your iron, on low heat and your marks go away. Also see Fabric Markers for Sewing.