So I have a recipe that calls for the above.  Upon searching you come up with various answers, but the bottom line is that it is copper oxide.  What I really want to know is whether it is red, black or some other color.  I have both of those and also some blue copper sulphate as well as the ol' standby, copper carb.  So what is it?, Buehler, buehler.....?  jhp

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It doesn't exist.   There's no such thing as Copper (VI) Oxide.  It's a typo.  There's such a thing as Cu2O3 (Copper (III) oxide), but I've never actually come across it at any pottery supply store. I think it's more likely that the recipe was calling for copper carb and the C dropped out.  

CuO3... yeah that would be some energetic compound. If it did exist, you probably would not want it in your studio.:-)

Keep in mind copper carbonate is not pure,  but a mix of 50% CuCO3 copper carbonate and 50% Cu(OH)2 copper hydroxide.

So the amount of  Black Copper Oxide  CuO  in each is the following:

                     CuO%
111.18% Red Copper Oxide - Cu2O  takes on extra oxygen in the kiln
100.00% Black Copper Oxide - CuO
71.95% Copper Carbonate (actual 50% CuCO3 / 50% Cu(OH)2)
81.53% Copper Hydroxide - Cu(OH)2
64.38% Copper Carbonate - CuCO3  theoretical

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