An Artist can draw on bisqueware and cover with a clear glaze using our underglaze Potter's Pens, which come in 18 different colors to choose from. There is also a wax resist pen. Potter's Pens can be fired to Cone 9 (except Rose Cone 4.) Our Potter's Pens are AP (Non-Toxic) Click here for an animation and instructions on how to use the Potter's Pens.