CO-21 is a highly fluid light blue glaze with iridescent crystals that flash pink, violet, and silver.

Apply to: Cone 04 Bisqueware

Number of coats: 4 coats

This glaze performs best at cone 5 but can be fired to cone 6. For best results, leave the inside or back of the form unglazed.

Can be fired in a normal medium-speed firing with no special cooling schedule required. To take this glaze to the next level, use a controlled cooling schedule for increased crystal growth

These glazes are prone to running so we recommend stopping your glaze about half an inch above the foot. You can also use a drip tray or soft bricks to protect kiln shelves.

These glazes can be fired in a normal medium-speed firing with no special cooling schedule required. To take this glaze to the next level, use a controlled cooling scheduled for increased crystal growth

Cone 5 = 1184 °C (at 150°C/hour for the final 100°C of firing) / 2201°F ( at 270°F/hour in the final 200°F of firing)

Cone 6 = 1241°C (at 150°C/hour for the final 100°C of firing) / 2266°F ( at 270°F/hour in the final 200°F of firing)