Copper Oxide Black
Cupric Oxide, Copper Oxide Green
Chemistry
|
Hazards
- Copper
Miscellaneous
- Family: Colorant
- Region: None
- Mined At: Unspecified
- Raw Mineral: No
- Generic: Yes
Notes
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 (Cuprous oxide oxidizes to cupric oxide in normal firings).
The oxide form of copper can give a speckled color in glazes whereas the carbonate form will give a more uniform effect.
Copper normally produces green colors in amounts to 5% where it moves toward black. In reduction firing, it turns to Cu2O and gives vibrant red hues. See CuO and Cu2O in the oxides database for more information.
Above 1025C copper becomes increasingly volatile and its crystalline sructure breaks down. At 1325C CuO melts. This can affect the color of other glazes pieces in the kiln. Glazes containing copper can change significantly because of loss of copper. Some potters alternate between reduction and oxidation, and even put a dish filled with copper carbonate in the center of the kiln to minimize this phenomenon.
There are many workable copper ores (i.e. tenorite, cuprite).
Source: American Chemet Corp., 708-948-0800 FAX 708-948-0811
See also: "Coloring Mechanism of Peach Bloom Copper Red Glazes" written by four technicians from China published in Dec 91 Bulletin of the American Ceramic Society.
Data
- Melting Point (MP): 1326C M
- Specific Gravity: 6.45
- Specific Gravity: 6.45
- Melting Point (MP): 1326C M
Linked Articles
COPPER & COMPOUNDS by Edouard Bastarache
COPPER & COMPOUNDS Toxicity by Edouard BastaracheCUIVRE et Composés - Edouard Bastarache
CUIVRE et Composés - Edouard BastaracheLeaching Cone 6 Glaze Case Study
An example of how we can use INSIGHT software to determine of a glaze is likely to leach
Suppliers
- Generic
Authors
- Tony Hansen (Owner)
XML
<?xml version="1.0" encoding="UTF-8"?>
<material name="Copper Oxide Black" descrip="Cupric Oxide, Copper Oxide Green" generic="1" rawmineral="0" searchkey="Black Copper Oxide, BCO" loi="0.00">
<families>
<family name="Colorant"/>
</families>
<oxides>
<oxide symbol="CuO" name="Cupric Oxide" status="" percent="100.000" tolerance=""/>
</oxides>
<hazards>
<hazard name="Copper"/>
</hazards>
<suppliers>
<supplier name="Generic" country="" url="" label=""/>
</suppliers>
<notes>
<note>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 (Cuprous oxide oxidizes to cupric oxide in normal firings).
The oxide form of copper can give a speckled color in glazes whereas the carbonate form will give a more uniform effect.
Copper normally produces green colors in amounts to 5% where it moves toward black. In reduction firing, it turns to Cu2O and gives vibrant red hues. See CuO and Cu2O in the oxides database for more information.
Above 1025C copper becomes increasingly volatile and its crystalline sructure breaks down. At 1325C CuO melts. This can affect the color of other glazes pieces in the kiln. Glazes containing copper can change significantly because of loss of copper. Some potters alternate between reduction and oxidation, and even put a dish filled with copper carbonate in the center of the kiln to minimize this phenomenon.
There are many workable copper ores (i.e. tenorite, cuprite).
Source: American Chemet Corp., 708-948-0800 FAX 708-948-0811
See also: "Coloring Mechanism of Peach Bloom Copper Red Glazes" written by four technicians from China published in Dec 91 Bulletin of the American Ceramic Society.</note>
</notes>
<testdata>
<testitem testname="0" value="1326C M"/>
<testitem testname="0" value="6.45"/>
<testitem testname="0" value="6.45"/>
<testitem testname="0" value="1326C M"/>
</testdata>
</material>
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