Just a word of warning to anyone using Frixion pens....
I marked a batik baby quilt with some designs for machine quilting. I injured my hand and had to take a few days off - when I resumed work on the baby quilt, I decided to change the design. I ironed the areas to remove the designs and the ink disappeared ..BUT.......the ink appears to have bleached the lines into the batik. They are noticeable, a bit faint but I can definitely see them. I don't know if it's because I used batiks (I prewashed!!), the lines were left on the fabric for a few days or if my pens have old ink - not sure why. Please be warned.