there are ton's of options in marking tools on the market, blue- water erasing markers; purple- air erasing markers; frixon pens- which erase with an iron; many different chalk pencils; along with ceramic and mechanical pencils with an array of colors. visit most any website (Nancy's notions, Clotilde's & Connecting Threads all carry an assortment) will have their favorites available. what ever you choose make sure you test it to be sure the marks will disappear.