These pencils have the same name, but one is dark lead and the other a white chalk like marking pencil that works great on dark fabrics. One of each will solve all of your marking issues. Both work well for cotton fabrics with the Sandboard we offer. The white one works great on any fabric-even dark woolens, and irons away with a warm iron! Use the dark pencil on lighter fabrics and the light pencil on light and darker fabrics or wool.