Underglaze Pens are a great tool for drawing designs directly onto bisqueware and offer similar precision to that of marker pen.
The range of Potter's Pens from Minnesota Clay Company feature a pressure-activated valve that “doses” underglaze paint onto bisqueware, and tips are removable for easy cleaning and refilling.
Their unique contour shape is comfortable to hold and the pens make a 1mm line, which can be made wider by drawing more slowly and increasing the pressure on the body of the pen
AP Non-Toxic and Dinnerware Safe when covered with a food safe glaze. Potter's Pens can be fired to Cone 9 (except Rose Cone 4.)