What kinds of pens or markers does everyone use when doing these quilts? I was told by someone that hey use a Jelly roll. Well when I went to Joanns and asked for a Jelly Roll Fabric marker the lady took me to the scrap book isle. She handed me a Gelly Roll pen that says it's waterproof. That was the only thing she could think of. Well I've had some issues. I wrote on a couple different pieces of fabric. Ironed it then washed and it seemed like it faded on all of them. One of them it completely washed out on. So what do you suggest? I'll put a pic of the block up also. They are writing on the yellow squares.