I was at my LA quilters house the other day, and she drew some lines with a purple pen on my quilt to show me what she planned to do. She said, "don't worry, these lines will disappear on their own, and I can also erase them with the other end of the pen." The opposite end of the pen contained a swab like thing that appeared to be damp. When she touched the marked area, it immediately disappeared. I plan to buy these pens, but I forgot to get the name/brand of the pen from her, which I plan to do so that I can order or purchase them.