Glossary
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Reference —  Ashes
In ceramics, ashes from trees, plants, or animal bones may provide fluxes for use in glazes. Ashes contain varying amounts of silica and alumina, as well as potash, iron, magnesia, phosphorus, and lime. Oriental glazes such as the temmoku frequently used rice straw ash, naturally high in silica. Tree and plant ashes are still popular glaze ingredients, while bone ash is used in making china.

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