I use the pounce with white powdered chalk on colored fabrics. For white fabric I use the same white powdered chalk mixed with blacklight chalk (which glows green under a blacklight but looks white in daylight). I also use Roxannes' white pencil on colored fabrics and her silver one on white. All these products come off easily and don't harm the cotton fibers long term. Occasionally I use a mechanical pencil with a light hand to mark a fine light line.