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This is a highly plastic fine particled ball clay (Plainsman C1). It is also high in lignite, the raw clay is almost black in the wet state. The top bar is fired to cone 10R, the bottom ones at cone 6, 8, 9, 10 (bottom to top). The burnoff of the carbonaceous material is so vigorous that it fractures the bars in oxidation, but in reduction, the effect is much less, likely having occurred during the last 30 minutes of the firing (which is clearing in oxidation).
Glossary |
Reduction Firing
A method of firing stoneware where the kiln air intakes and burners are set to restrict or eliminate oxygen in the kiln such that metallic oxides convert to their reduced metallic state. |
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