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An example of a highly fluid glaze melt that has pooled in the bottom of a bowl. While it may be decorative, this effect comes at a cost. The fluidity is partly a product of high KNaO, not surprisingly it is crazing like mad! The crazing weakens the piece, much, much more than you might think. Those cracks in that thick layer at the bottom are deep, they want to continue down into the body and will do so at the first opportunity (e.g. sudden temperature change, bump). Also, fluid glazes like this are much more likely to leach. Commercial glazes like these are not somehow exempt, they can have the same issues.
Glossary |
Transparent Glazes
Every glossy ceramic glaze is actually a base transparent with added opacifiers and colorants. So understand how to make a good transparent, then build other glazes on it. |
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Glossary |
Melt Fluidity
Ceramic glazes melt and flow according to their chemistry, particle size and mineralogy. Observing and measuring the nature and amount of flow is important in understanding them. |
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