The final process in making a pot is to consign it to the fire. The kiln at Winton Pottery is gas-fired and contains up to three or four weeks work. It can take a day to stack and fill it, and the firing takes up to 18 hours, at the end of which it will have reached a temperature of 1250 degrees centigrade. For the last 10 or 15 minutes of the firing the air supply is dramatically reduced so that fuel burning will extract oxygen from the glazes, changing their chemical structure and hence their colour. This process is known as reduction Another day is then necessary for it to cool down sufficiently for the pots to be removed.
Click on image to view the kiln being opened after firing