The mug on the right was bisque-fired and then glazed, the one on the left was glazed in the green (dry) state using our standard meet-two-colors-at-the-rim glazing method. This method lends itself well to single fire glazing. Notice the glaze did not go on as thick on the once-fired piece (I should have used a slurry of higher specific gravity) and preheated the piece. In addition, there are a few pinholes, whereas the bisqued piece is flawless. Single-firing ware requires extra attention to firing, doing a bisque schedule first (to enable hydrates and carbon to escape) and then proceeding right into the glaze firing schedule.
| 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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