A ceramic glaze is a coating that changes when a clay object is heated in a kiln. Intense he melts sele ingredients a creates smo surfaces th cover fi pottery wi layers resem glass a added mine can produce distinctive colors. The appearance after firing may differ from the appearance of the coating before it enters the kiln. Potters therefore use test pieces to discover how a mixture behaves under particular conditions. Temperature and the atmosphere inside the kiln can both affect the result. Glaze is consequently more than painted decoration: its final surface develops through a transformation of materials.

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