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This is beyond interesting if you want to know more about glazes, recipes and their chemistry. This is simple and easy for anyone to understand. Watch me adjust the recipe of my high-calcium transparent cone 6 glaze to convert it to a calcium matte. I'll do it in my Insight-live.com. We'll cut the Si:Al ratio, increase the CaO further, maintain the thermal expansion for glaze fit and make the recipe shrinkage-adjustable using a mix of calcined and raw kaolin.

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This is a calcium matte base (as opposed to the magnesia matte G2934). The clay is Plainsman M390. 5% Zircopax was added on the left (normally 10% or more is needed to get full opacity, the partially opaque effect highlight contours well). 5% tin oxide was added to the one on the right (tin is a more effective, albeit expensive opacifier in oxidation). The PLC6DS firing schedule was used.

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On a clay test tile this titanium opacified cone 6 oxidation glaze, G1214Z1, looks great. But it is important to recognize that its variegated fired appearance is a combination multiple factors: The chemistry of the glaze, the titanium, quality laydown, the PLC6DS firing schedule, the red M390 clay body and variations in the thickness-of-application. However, the last four of those factors changed with the mug on the right! It is made from buff-burning M340! There are drips from uneven drainage during glazing. The slow cool C6DHSC firing schedule. Notice how it is actually going transparent where very thick. An even laydown was not achieved since the slurry was not properly mixed, it contains calcined kaolin and requires special attention to achieve a thixotropy.

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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). The difference is surface character is visible.
| Media |
Converting G1214M Cone 6 transparent glaze to G1214Z matte
How I converted a glossy glaze into a matte glaze by using glaze chemistry and recipe logic. |
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