Drop-and-soak firing fixes this pinholing problem

Clay bodies having coarser particles, e.g. those ground at 42 mesh, often create pinholes on the fired glaze surface. The problem is most serious on tooled surfaces (like the base of this mug on the left). These two low-temperature pieces were made from the same clay and the same glaze. But the one on the right was fired using the C04PLTP drop-and-hold firing schedule. That has eliminated the problem on the mug on the right.

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Glossary

Drop-and-Soak Firing
A kiln firing schedule where temperature is eased to the top, then dropped quickly and held at a temperature 100-200F lower.

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