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The clay is a buff stoneware. The upper two samples are G2934, an MgO matte. The one on the right has 10% zircon added to opacify.
The bottom two are G1214Z1 (transparent version and opacified-with-zircon version).
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This melt fluidity tester demonstrates that the cone 6 G1214Z recipe fires highly melt fluid, much more than one might expect from a matte glaze. When applied as a thin layer on pottery it does behave as a matte glaze. A quick look at its chemistry reveals the reason: High CaO and a low Si:Al ratio. Unfortunately, many matte glaze are such simply because they are not melted enough.
Glossary |
Opacifier
Glaze opacity refers to the degree to which it is opaque. Opacifiers are powders added to transparent ceramic glazes to make them opaque. |
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Glossary |
Medium Temperature
These are stoneware glazes that fire in the range of 1200C (2200F). They often contain boron to assist with melting. |
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