Why would I mention Sharpies on a gluten free food blog? We use them in the kitchen all the time. We write on things like butter tubs, peanut butter jars, jelly jars. We write either gluten free or glutened. Our family is divided with 2 people currently eating gluten free and 3 people currently not eating gluten free. This is an easy way to keep my son and I from accidentally getting glutened because someone put their knife on the bread, then back in the peanut butter jar!