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canyon fox

Black Cobalt Oxide

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Also the Cobalts 'spit' on other vessels in the kiln.

 

 

Cobalt is know to fume out of a glaze during firing and leave blushes on the pots next to them, or even a ring of blue on the kiln wash on the shelf. Depends on the glaze and percentage of cobalt in it.

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The oxide is about almost twice as strong as cobalt carbonate-if I recall its like 1 1/2 times as strong for same results

Mark

 

 

If the recipe calls for cobalt carbonate, you can use 2/3 as much oxide. If it calls for oxide, you can use 1 1/2 times as much carbonate.

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Also the Cobalts 'spit' on other vessels in the kiln.

 

 

Cobalt is know to fume out of a glaze during firing and leave blushes on the pots next to them, or even a ring of blue on the kiln wash on the shelf. Depends on the glaze and percentage of cobalt in it.

 

 

 

I prefer to say 'spits' due to the little dots that it can leave on neighboring ware. By the way, I like it.

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