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COPPER OXIDE—BLACK

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9 275 A$9.00 - A$275.00
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Copper Oxide—Black
Copper Oxide is one of the oldest colorants used by potters and is the most stable form of oxidized copper. It is a popular source of copper in glazes and glass. It is a very strong flux (A ceramic flux functions by promoting glass formation in clay bodies and glazes.)  The oxide form of copper can give a speckled colour in glazes whereas the carbonate form will give a more uniform effect. Copper normally produces green colours in amounts to 5% where it moves toward black. In reduction firing, it turns to Cu2O and gives vibrant red hues. It the glaze is fluid copper will tend to crystallize heavily.

Above 1025°C, copper becomes increasingly volatile and its crystalline structure breaks down. At 1325°C, copper melts. This can affect the colour of other glazes pieces in the kiln.

 

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