Secret Stuff is an isopropyl alcohol-based liquid chalk. Rub a small amount on your hands, let dry, and a perfect layer of the highest purity Magnesium Carbonate magically appears. The perfect "clean" alternative to loose chalk. Liquid Chalk Isopropyl Alcohol Based Mid-Session Refresher Training Partner Less chalk dust, less mess Use Secret Stuff as a total chalk replacement or as a mid-session refresher. Whatever the use, you can be sure you&';re getting the highest quality, most hygienic, longest lasting chalk anywhere.