Recently I had my own pencil nightmare with Sewline's black marker. The package says marks wash out easily with water and because Sewline features ceramic leads, I assumed the black was also ceramic. I used it to mark an applique design on the back of white borders, marking rather heavily. I unfortunately miscalculated the length of the borders, cutting them too short. The fix to solve that problem meant the marked design was not used on the corners. The marked lines were visible from the front but I assumed they would disappear in the final wash. After washing the finished quilt, I was horrified to still clearly see the black lines . Boy, I went through every known stain remover and remedy I could find and nothing would remove those marks. I finally called Sewline and a nice lady in quality control suggested Dritz Magic Wand Stain Remover. It didn't remove the marks completely, but faded them enough that they are not visible. The graphite Sewline is a great tool, but one has to know it's limitations to correctly use it.