I wrote the name of each color: black, purple, pink, orange, brown, blue, and red upon a piece of plain white muslin. No problems there, the pens were terrific at marking.
I immediately ironed the muslin and all the marks (and I mean everything) completely disappeared as advertised. Now I just had a scrap of white muslin, identical to every other scrap of white muslin in my sewing room, so I thought I had better mark it or it would end up in my Dear Jane by accident. I wrote "test piece" on it with a Pigma Pen, because marks from those pens are forever.
The scrap of muslin then got washed in the washing machine with warm water, then put in the freezer for a few weeks. Here is the result:
Now, most people would say, "Well, I am never going to put my quilts in the freezer!" and they are right, of course. But my family, like thousands of others up in Wisconsin, have a cottage on a lake out in the middle of the north woods. A cottage which remains unheated for most of the winter, a very cold cottage! Christmas presents kept in car trunks in Green Bay can get bitterly cold too. (No one runs out of freezer space over the holidays when you can say things like "Get the ham out of the Buick.")
I like FriXion pens; in fact, I like them a lot, but I would not use them on the top of my Dear Jane, or on any quilt I ever plan to send to the great white north. Something to consider.
Susan in Texas