For those worried about leaving a chemical in the fabric, the ink in these pens is acid free and archival quality (though the people at pilot thought I was crazy for asking that- they highly do not recommend using them for archiving, due to the ink disappearing at high temperatures- not good for long term storage, where it might disappear)

The chemicals will not harm fabric. And, it washes out anyway, so it is really only a concern if you aren't washing it.

The temperature is below freezing here at night already. I just shipped a quilt to my sister. If I had used this pen to mark the top, it is possible the lines would appear in shipping.

I just discovered a disappearing fabric marker at Michael's for about $3.00. It goes on purple and disappears after about 48 hours. I think it is the greatest thing since peanut butter, but have only used it on cotton doll faces and seam markings for clothes so far. On quilts I usually use soap slivers.

I've never questioned the 'Pilot' brand since I've had no problem but wondering what the Pilot company would say!

During the coldest part of winter, I would say my quilts freeze every night!!! That happens when there is no heat in the room, and you can't afford to run portable heaters.

I got mine at an office supply store. Can't remember if it was office depot or staples.

good grief, Sandra H I just noticed you have my married Sister's name! funny.

You can purchase them at Staples. Ours only had black, blue and red.

You can get them at LQS's as well.

I have used them quite a bit and LOVE them!

I bought one and loved it - marked all my squares --- ironed my first seam and my markings disappeared! Had to remark. Also heard not to get it cold as the marks reappear!

When I saw them on this board, I ran to Staples & got some. They work great, but some times I forget the ink disappears when you iron the fabric.