Creating Reduction

Stoneware Firing

After reaching cone 010 (1650° F / 900° C), in a stoneware firing that goes to about cone 9–10 (2350° F) many potters choose to "begin reducing" because it lends a rich toasty color to the clay body and changes some glaze colors.

This is accomplished by adjusting the ratio of fuel to oxygen by increasing the fuel and/or closing the damper (or cutting back on blower speed in a forced air burner). If the damper is closed too far, the rise of temperature will stall. Therefore, a delicate balance must be maintained to continue a rise in heat while simultaneously creating a reduction atmophere. (Also see the Kiln Control page.)