The basics Use the Dritz Mark-B-Gone Blue Marking Pen is used for marking light fabrics. The benefits Wipe off the markings using a damp cloth. For best results, use only on washable fabrics. The uses Draw applique lines, trace weaving sketches or mark quilting and needlecraft designs. The bottom line This pen is ideal for transferring pattern markings and for marking exact locations of buttons and embellishments in your fabric-based projects.