The cone 6 porcelain mug on the left was successfully single-fire glazed by first pouring the inside (using a dipping glaze) and allowing that to dry thoroughly. The lip was then waxed, and the excess glaze that went over it was trimmed off. Finally, the outside was glazed by dipping the rim and then turning it over immediately and dipping down to the rim. The mug on the right was glazed on the inside and outside at the same time (by pouring, then dipping). As a result, it was over-whetted, and the body laminated within and bubbled during drying.
An alternative method: Mix it as a brushing glaze, apply one thinner coat at a time, drying each thoroughly before the next.
| Glossary |
Once-Fire
The practice of once-firing ceramics (no bisque) to produce fully glazed products. Considerable technical expertise and good testing are required to make it work. This is not a shortcut to skipping bisque firing. |
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