Marvy LePen has a fine point for accurate, easy-to-see drawing of both straight lines and free hand curves. The fine point makes lines and marks more visible and is easy to use with a straight edge ruler. Marks with a bright teal ink that is acid-free, and will wash out whether heated with an iron or not. Washes out with a brief soaking in water. Use for marking embroidery or quilting designs on light-colored fabric. Can also be use for writing on paper and other surfaces.