Minnesota Clay's underglaze potter's pens are used to draw on bisqueware and need to be covered with a clear glaze. All colors are stable up to cone 9, except Rose which should fire above cone 4.
How To Use:
A spring loaded tip presses down when writing to allow underglaze to flow out. Remember to keep the tip down and lightly squeeze when writing. Signing the bottom of your work will not stick to your shelves.