I also use the Sewline pencils. The green lead has become my go-to color, for sure. No matter how I mark with the green - a dark line or light line - it always washes out. I recently marked up a quilt that included muslin-colored Kona fabric and not a mark to be seen after washing it. I've found the green works great with any fabric color - except green! With green fabric I use the yellow lead. I've thrown out every other marking pencil I had.