Copper Oxide Red
Chemistry
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Significant Temperatures
- 1210C: Melts
Hazards
- Copper
Miscellaneous
- Family: Colorant
- Region: None
- Mined At: Unspecified
- Raw Mineral: No
- Generic: Yes
Notes
Red copper is a reduced form of the normal black copper oxide (CuO). In normal oxidizing firings it will transform to the cupric oxide form (CuO) to produce the normal green coloration in glazes and glass. If fired in reduction, it will maintain its Cu2O structure to produce the typical copper red color. See CuO, Cu2O oxides for more information.
If red copper oxide is considered as a source of CuO to the final glaze, which in most cases will be true, the conversion factor is 1.12. This reflects the fact that the Cu2O picks up an extra oxygen atom to become 2CuO, weighing 1.12 times more than Cu2O.
Source: American Chemet Corp., 708-948-0800 FAX 708-948-0811
Note: Red copper oxide is usually surface coated to prevent oxidation. For this reason, it may be very difficult to get the material to mix with a glaze slurry. If so you must soak the material in alchohol to wash the surface or add a few drops of deterget to the glaze mix.
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.
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 Red" descrip="" generic="1" rawmineral="0" searchkey="Cu2O, Red Copper, RCO, Copper (I) Oxide, Cuprous Oxide" loi="0.00">
<families>
<family name="Colorant"/>
</families>
<oxides>
<oxide symbol="Cu2O" name="Cuprous Oxide" status="" percent="100.000" tolerance=""/>
</oxides>
<hazards>
<hazard name="Copper"/>
</hazards>
<temperatures>
<temperature temperature="1210C" notes="Melts"/>
</temperatures>
<suppliers>
<supplier name="Generic" country="" url="" label=""/>
</suppliers>
<notes>
<note>Red copper is a reduced form of the normal black copper oxide (CuO). In normal oxidizing firings it will transform to the cupric oxide form (CuO) to produce the normal green coloration in glazes and glass. If fired in reduction, it will maintain its Cu2O structure to produce the typical copper red color. See CuO, Cu2O oxides for more information.
If red copper oxide is considered as a source of CuO to the final glaze, which in most cases will be true, the conversion factor is 1.12. This reflects the fact that the Cu2O picks up an extra oxygen atom to become 2CuO, weighing 1.12 times more than Cu2O.
Source: American Chemet Corp., 708-948-0800 FAX 708-948-0811
Note: Red copper oxide is usually surface coated to prevent oxidation. For this reason, it may be very difficult to get the material to mix with a glaze slurry. If so you must soak the material in alchohol to wash the surface or add a few drops of deterget to the glaze mix.
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>
</material>
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