PMC+: cone 010, hold for ten minutes
Art Clay Silver: cone 011, hold for ten minutes
1) Select the cone number above for the silver clay you are firing. Place that cone on the kiln shelf. Select a cone for the Kiln Sitter that will make the witness cone on the shelf bend to maturity. (For instance, you may need a cone 09 in the Kiln Sitter to make the cone 010 on the shelf bend to maturity.)
2) Fire the kiln. Slow the kiln during the last hour to approximately 108 degrees F. per hour.
3) When the Kiln Sitter trips, raise the weight and press in the plunger. Gently lower the weight. The Kiln Sitter is now firing on manual and will no longer shut off the kiln, so use caution to prevent over-firing. Turn the kiln switch to Medium and continue to fire for 10 minutes. Then turn off the switch and allow the kiln to cool to room temperature.
Fire a test piece for your first firing. You may need to experiment with the switch positions to maintain the correct temperature during the 10-minute hold. It would also be easier to hold the correct temperature if you used a pyrometer, which shows the temperature inside the kiln.