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The original Stull chart - Chart 1 from Transactions of the American Ceramic Society, Vol. XIV (1912). Stull mapped test glazes by their SiO₂:Al₂O₃ molar ratio and identified the regions that predict surface quality.
If you really want to "get into the weeds" of glaze chemistry, the https://stullatlas.app tool, by Ryan Lack, takes Stull's insight and applies it to a modern dataset of real-world glazes, giving you an interactive map of the glaze chemistry landscape. The primary dataset comes from Glazy. It contains thousands of community-contributed recipes with calculated UMF values, cone temperatures, surface types, and firing atmospheres. Each point on the chart represents a real glaze recipe that someone has mixed, fired, and documented.
| Glossary |
Stull Chart
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| Glossary |
Glaze Chemistry
Glaze chemistry is the study of how the oxide chemistry of glazes relate to the way they fire. It accounts for color, surface, hardness, texture, melting temperature, thermal expansion, etc. |
| Oxides | CaO - Calcium Oxide, Calcia |
| URLs |
https://stullatlas.app/#/about
Stull Atlas - A Computational Ceramic Glaze Explorer - 114 years after Stull Stull Atlas is a tool for ceramic artists and glaze chemists. It lets you explore thousands of glaze recipes mapped onto a Stull chart - the standard coordinate system for understanding glaze chemistry through Unity Molecular Formula (UMF). |
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