Just wanted to let you know that I used some gray chalk to mark something I was hand quilting. I also used the blue wash out pen. The pen washed out beautifully. The chalk is still there. The quilt is for me, so I'm going to wash it again and try and pretreat that spot. I ran them both through the lines on the stencil. I used premade stencils I found at Hobby Lobby, JoAnn Fabrics, or Hancocks.