Which copper oxide is green

The best colors are generally obtained with fast firing and little soaking. CaO is unlikely to affect the color of copper in a glaze. Purple copper reduction glazes are the result of a mixture of copper in its green oxidized and red reduced forms. This effect appears most frequently in high lime glazes or where early stages of firing are oxidizing or latter stages are light or neutral.

That means that the base clear might craze , yet the version with significant copper added will not. Copper is well known for this effect in glazes at other temperatures also. Do a leaching test to be sure. Using a green stain should prevent this.

Or some B 2 O 3 could be substituted with SiO 2 via glaze chemistry. These are four cone 6 glazes of diverse chemistry. They have varying melt fluidities. They are soaked half way up in lemon juice over night.

None show any evidence of surface changes. If the copper was increased, especially to the point of going metallic or crystallizing, likely the leaching test would have different results. So, if you use copper sensibly in moderate amounts , there is a good chance you can make a glaze that resists leaching. All common traditional ceramic base glazes are made from only a dozen elements plus oxygen.

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