Originally Posted by nor'easter

Pigma pens use pigment based ink instead of dye based ink. They don't bleed through thin paper or fabric and are archival. Here's the maker website: http://www.sakuraofamerica.com/Pen-Archival

I did not see them on the Office Depot website, but you can get them at Joann's, at most quilting shops (local and online), and at art supply stores. I get mine from Dick Blick for the variety of colors and sizes he carries. http://www.dickblick.com/zz207/02/.