Better safe than sorry, I always say. I use a purple felt tip. I don't know the brand name because I think I wore it off -- anyhow, I do bits at a time because it just disappears on me. I am speaking of the ink!! If I don't get into place what I have to after using the pen for marking, it just fades away in to never-never land. Knowing me and my ways, this is the safest I have ever used. I got it at JoAnn's. I love it and is a perfect gift to a quilter, but just buy one - they last quite a while and you sure don't want it drying up on you. I have been using the same pen for around 1-1/2 - 2 years now. Just keep the cover on tight. It's a good 50% off buy!
Speaking of 50% off, I got an email from JoAnn's the other day- a Happy Birthday to me --- 20% off of anything regular priced and/or sale priced and it is for a total purchase. I CAN HANDLE THAT! I can get my batting and quilt backing off for approximately 40-70% off.
Happy Birthday to me! Edie