Originally Posted by
haylillan
i tested my pen by marking on 2 pcs of scrap i ironed 1 off and washed other off than ironed put both in freezer. the 1 I washed didn't come back. so the answer is dont iron your blocks until you've rinsed block just under running water
That's weird- I've always ironed mine off, and then washed them and the lines never come back. No need to wash first then iron, I don't think.
(And why are people putting their quilts in the freezer! It's really unlikely situation that your quilt will be so cold. Although- the one that sits in the back of my car in the winter in probably gets colder than the freezer, but the lines have never re-appeared.)