I own a small business, Superior Marker Company, and we make a unique type of blue chalk that's used to mark the Bible, Blueprints and some Textbooks. The chalk erases from the paper, without harming it or leaving a permanent mark. Necessary to our process is a surfactant listed above, with two CAS Numbers, namely 68649-05-8 and 12676-21-0. One trade name for this product is "Armeen Z", but it is no longer manufactured by Akzo Nobel. I'm scouring the globe for this product so if anyone knows where it can be found or if someone can synthesize it, please contact me, Debra Keller at superiormarkerco@comcast.net or phone me at 707-778-6370. Thanks!