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Are any two kilns are exactly alike?

Changes in firing

All clays and many minerals contain water which does not leave the body until above 700°F. Organic (carbon) materials need to be oxidized (burned out). Other minerals, such as calcite, break down and give off a carbon dioxide gas. Minierals such as flint (silica) undergo a sudden expansion on heating to 1060°F and contraction during cooling.

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