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Glaze Firing
Ceramic glaze is an impervious layer or coating applied to bisqueware to color, decorate, or waterproof an item. For earthenware, such as fired clay pottery, to hold liquid, it needs a glaze.
Potters apply a layer of glaze to the bisqueware, leave it to dry, then load it in the kiln for its final step, glaze firing.
The glazed item is carefully loaded into the kiln for the glaze firing. It must not touch other pots or the glazes will melt together, fusing the pots permanently. The kiln is heated slowly to the proper temperature to bring the clay and glazes to maturity, then it is slowly cooled again. The kiln is opened and unloaded after it has cooled completely.
This second kiln firing causes a remarkable change in the clay and glaze. It completes the transformation of pots from a soft, fragile substance to one that is rock-hard and impervious to water and time.
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