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https://en.m.wikipedia.org/wiki/Hessian_crucible
These were made in Germany from the late middle ages, fired from kaolinitic clay to produce mullite, making them resistant to heat and thermal shock. The clay, being impure, may have contained that acted as a catalyst to form mullite better than pure kaolinite.
| Glossary |
Crucible
In ceramics, potters make crucibles to melt frits, stains and other materials. Crucibles are made from refractory materials that are stable against the material being melted in them. |
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