Originally Posted by
HouseDragon
The fact that now you see it, now you don't, now you see it again makes me leery of using them at all. The chemicals are obviously not washed out.
I took a Harriet Hargrave class and this was her point as well. She says we don't know what those chemicals do to the fabric long-term, either - it could be weakening the fibers and we won't know until a decade later. So she recommended
against Frixion pens for that reason.
I tried them anyway and I don't like them because apparently I make my lines too fast - they vanish as soon as I make them, probably from the heat of the ball point rolling over the fabric too quickly. I love my blue water-erase markers, as long as I'm careful not to let the iron hit them they wash out so cleanly and easily. I use old fashioned tailor's chalk for anything that will need to endure heat.