The body is Plainsman M390. The firing schedule is Plainsman PLC6DS.

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The Zircon needed to opacify glazes has a side effect: Crawling. Even low percentages can induce this issue when other factors interplay (as is the case here). It often happens at sharp concaves (e.g. inside bottom corners on mugs). But here it is on surfaces disturbed during formation of the spout. This G2934 recipe has good melt fluidity, so that is not the issue. The issue appears related to adherence of the initial laydown. Here are some questions to consider:
| 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. |
| Materials |
Zircon
|
| Materials |
Tin Oxide
Its principle use in ceramics is as an opacifier in glazes. It is very expensive. |
| Recipes |
G2934 - Matte Glaze Base for Cone 6
A base MgO matte glaze recipe fires to a hard utilitarian surface and has very good working properties. Blend in the glossy if it is too matte. |
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