I have tried everything and finally decided on the Chaco pen with white chalk or pink chalk. It brushes out with your finger nail if you don't like the way you drew the line. It goes on so easily, and comes off easily, too. I admit that I have to go over the lines a few times before finishing the block because it's easy to brush them out as you quilt. I'm not saying it's the only way to go, but it works for me. And for feathers, it was great on the last quilt I just finished.