There was a thread here about how they washed and it still came back in the freezer. on the 3rd attempt they scrubbed the ink with stain remover and finally it didnt come back in the freezer. Would I use them? Nope. I like Dritz blue ink that is water soluable. They aslo have disappearing ink that I have used. I've used the blue dritz for my last two quilts with no problems. Mark as I come to that section, when done mist with water bottle, and it vanishes. As soon as the quilt is quilted I wash. After 2 weeks the ink is perm. so its best to mark as you go if you arent a marathon quilter.