JANE QUILTER'S CONCLUSION:
Surely, one conclusion to this adventure, is to test EVERY marking pen on a sandwiched sample of the fabrics you are using in your quilt. Danger lurks with every option, such as the "turquoise" in frixion pens, the "yellow" in crayola washable markers. The "blue" in washable pens from China. Marking Chalk dust that does not even claim to come out. Non-washable pencils (once the package is tossed, how do you remember?). Manufactures of fabric, dyes, sizing, marking tools are constantly changing materials or vendors to "improve" or "reduce costs". No marking technique for fabric is safe from change, so test, test, test and remember what worked for me today, might not work for you tomorrow. Let us all keep vigilant and continue to share ideas, results, products, recipes, and test results through our Quilting Board.