COPPER OXIDE—BLACK
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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.
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.