Use this heat erasable white pen to trace your embroidery design onto dark fabric. I tested the pen on black cotton. The lines took a couple of seconds to appear which may prove challenging for some people. The lines all disappeared with my hair dryer (I hate to iron!). This is a good erasable option for tracing designs to darker fabrics!
From Bohin: "For dark fabrics in quilting, sewing and craft projects. Marking appears spontaneously and clearly after a few seconds. The ink is iron erasable only. The heat of the iron will volatilize ink instantly. Always try on a sample of your fabric before using." Made in Japan.