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Copper Oxide, Black - CuO

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One of the oldest colorants used by potters. It is a popular source of copper in glazes and glass. It can act as a strong flux. It is the most stable form of oxidized copper. Copper normally produces green colors in amounts to 5% where it moves toward black like in Oribe glazes. In reduction firing, it turns to Cu2O and gives vibrant "Copper red" hues.
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