Cobalt Oxide

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It is a metallic coloring oxide that produces blue in glazes at all temperatures. More details...

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Black Cobalt Oxide (Co3O4) is the principle source of CoO used in glazes, glass, and enamels. It is a metallic coloring oxide that produces blue in glazes at all temperatures. It occurs in ores with nickel, arsenic, sulfur, and manganese in deposits in Canada, Morocco, and southern Africa. The oxide is extracted using a hazardous roasting process yielding toxic by-products of arsenic and sulfur. The associated ores may contaminate the Co3O4 to some extent (i.e. with Na2CO3).

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