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The glaze is L4655 fired at cone 6 using the C6DHSC firing schedule (the glaze is Alberta Slip with a frit addition and 4% titanium dioxide). These mugs were in the same firing. On the porcelain (left) the glaze fires the expected floating blue. The degree of difference on the right has two contributing apparent factors. While other clay bodies of similar color do not affect this glaze as much, the body used in the mug on the right contains Plainsman 3B, at cone 6 it vitrifies (releasing iron compounds) and it releases iron in soluble salts that are interacting with the glaze. Titanium is very sensitive to the presence of iron and this body is making it available in an effective form. The difference would be much less if rutile had been used, since it already contains significant iron.
Materials |
Titanium Dioxide
A super white powder used in ceramic glazes to variegate, opacify and moderate color. |
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