Thanks so much for doing this lab experiment. It's nice to know that I can now find inexpensive and easy-to-find replacement markers for those reduculously priced quilting pens that don't always wash out and once ruined my dressmaker cover. (The marks ate holes right through the stretch fabric that covered "Miss Ellie's" torso.) Now...off to shop for some. I think I'll try the Dollar Store first, to see if they have these markers in stock. If not, then on to Walmart.
~ C