Many metal oxides provide the colors in glazes after being fired at high temperatures.

Stoneware must be fired at temperatures of up to 1,300 degrees, sometimes for as long as 24 hours.

This pottery was made from clay and fired over open or semi-open pits at temperatures around 700 degrees Celsius.

This achievement coincided with kilns that could be fired at higher temperatures.

The colored enamels are fired at high temperatures, which makes the glass stand out, giving a raised, relief effect.

They were fired at temperatures between 500-600 C, which suggests the development of ceramic firing technology before the advent of pottery proper.

It is fired at extremely high temperatures, around 1100-1300 degrees Celsius.

It is generally fired at lower temperatures than either stoneware or porcelain, and can remain semi-permeable to water until glazed.

This early pottery was soft earthenware, fired at low temperatures.

Among her contributions was a formula for clay that could be fired at low temperatures.