Originally Posted by BellaBoo
I marked all over a white cotton tone on tone with every color of the pens I have in the set. I didn't iron it. I washed the fabric in a load of towels and dried it with the towels in the dryer. I put it in the freezer (sub 0) over night. No marks appeared. I am sure the ink washed out.
That sounds great. Thanks for the info on your test. I feel much better. A quilt teacher of mine who has always been extremely careful about marking her quilts swears by these pens.