Anyone who hasn't gotten the friXion marker by pilot is missing out on a great product. You can find a 2 pack at Walgreen's for 3.99 and an 8 pack at office supply stores for 16.99. The 8pk has a lime green and a purple that show up fairly well on a dark brown. Haven't tried it on a black. It's great to mark stop sewing lines or to mark points or really anything. To get rid of the mark you touch it with and iron. It's amazing.