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Unfired clay remains porous, so it can't be used to hold any liquid and if it is immersed in water, it will dissolve. So it must be fired. Native Americans and many potters use wood fired kilns which take several days to reach the necessary temperatures and to cool down after firing. Most professional potters use gas or eliectric fired kilns which reach the very high temperatures needed to mature clay and glazes.

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15y ago

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