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This cone 6 matte glaze is variegated and colored using an addition of raw metal oxides and a variegator. It was fired using the drop and hold PLC6DS schedule (left) and slow-cooled with the C6DHSC schedule (right). Both have very good surfaces even though it is a calcium alumina matte (the unity formula reveals high Al2O3 (0.5), an SiO2:Al2O3 ratio of less than 5:1 and CaO at 0.75). The recipe is proprietary (from a customer) and it is unusual - it is not common for only 0.16 B2O3 (Gerstley Borate) and yet be melting as well as this.
You only need one additional detail to be able to calculate the base recipe for yourself using glaze chemistry (the remainder of the fluxes are KNaO). However, the combination of coloring oxides and variegators is most of the magic of this appearance, I can't tell you those. But the nature of the surface should preserve with a variety of raw metal oxides or even with stains.
Glossary |
Firing Schedule
Designing a good kiln firing schedule for your ware is a very important, and often overlooked factor for obtained successful firings. |
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