COPPER CARBONATE LIGHT GREEN (CUCO) is a major green colorant in glazes. The carbonate form is preferred to the oxide in producing blue-greens or copper reds in reduction. Minimum order quantity is 1 lb. Used to be Copper was made in Nashville TN. They went out of business 7+ years ago. We sell French (Bernardy Corp.) copper, 56% copper (the rest is carbonate). It is virgin (not reclaimed). Copper Carb is alsobeing produced in China, England and Mexico (chunky).