On the advice, as Nähanfängerin, I ordered these "self-extinguishing trick marker". I'm a fan of the PRYM products. However, this pin is not approaching as great as expected. I wanted to sign me guides for better sewing, including the pen should be well indeed. I tested as described on 2 different cotton fabrics. After 72 hrs., The color is still to see, especially as it shines through, which is pretty useless in a bright cloth.