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What are oxides?

Cobalt

Cobalt Carbonate and Cobalt Oxide. This is the most powerful color and produces various shades of blue. It can be harsh used by itself, so is sometimes mixed with iron, manganese, magnesium or copper to create more subtle colors. Like iron oxide, it can be added to glaze, or can be applied to the clay surface and fired to stoneware temperatures. By itself it will tend to create a dark slate metallic finish.
It can be mixed with manganese and iron to produce rich black slips.

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