"Markings stay on at least 3 hours and then disappear automatically after 1-7 days (may vary with material and surroundings such as temperature, humidity and air circulation). Use on-board eraser for immediate removal. Test all fabrics before using by making a mark and ironing it. After marking, fabric needs to be heated/ironed, or treated with clean water to prevent discoloration." (per manufacturer) 2-in-1 Precision Tip Fabric Marker with Eraser! Precision tip marker on one end with wide slant eraser on the other used for quilting, decorative embroidery, handicraft, dressmaking and more!