The mug on the left was bisque-fired and then glazed, the one on the right was glazed in the green (dry) state. The glazes are the same inside and out, but the porcelain one on the right is based on New Zealand kaolin (vs. American kaolin on the left). Three secrets for success for the one on the right were: It was glazed inside and out in two operations with a drying phase between; it was heated to about 150F before each application, and it was fired with a soaking period (at about 1900F) on the way up to top temperature (cone 6) to clear any gases generated by the body or glazes.
| Troubles |
Glaze Pinholes, Pitting
Analyze the causes of ceramic glaze pinholing and pitting so your fix is dealing with the real issues, not a symptom. |
| 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. |
| Firing Schedules |
Plainsman Electric Bisque Firing Schedule
Three-step to 1832F |
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