I use two different types of marking pens and both come out. I use Chaco rolling markers in yellow for dark fabrics. It brushes right off. On light fabrics, I buy a pen at Hancock's made by Dritz I think???? It's a white pen with a purple end and purple cap. It evaporates away, so you have to sew what you mark right away. The mark will not be there the next day. Both of these have worked well for me for years.