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The recipe, G3806B, also contains 2.5% tin oxide. The clear base is the best we found to host the copper blue effect. It was adapted from one found online, we recalculated that to source the Al2O3 more from clay and less from feldspar (to get better slurry properties). Later work was done to try to reduce the thermal expansion of this, but successes in doing that came at a loss in blue color. The COE of this simple enough to fit many bodies without crazing, porcelains having low silica percentages are least likely to fit.
| Materials | Copper Carbonate Basic This form of copper carbonate is the article of commerce, a mixture of theoretical copper carbonate and copper hydroxide. | 
| Materials | Copper Carbonate A source of CuO copper oxide used in ceramic glazes to produce a variety of colors (used only or with other colorants). | 
| Articles | Concentrate on One Good Glaze It is better to understand and have control of one good base glaze than be at the mercy of dozens of imported recipes that do not work. There is a lot more to being a good glaze than fired appearance. | 
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