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These are fired around cone 8. On the far right is 15% zircopax (left has none). Zircon is however very expensive and its use on bricks has to be rationalized, or at least minimized. In this case a white engobe applied first would greatly reduce the zircon percentage needed.
| Materials |
Zircon
Zircon (zirconium silicate) is a hard, dense, refractory ceramic material used to opacify pottery glazes and in refractory products such as kiln washes, crucibl |
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