When clear-glazing terra cotta ware made from Plainsman L215 special care is needed to get the right thickness of application. This body is a challenge because it contains lots of coarser particles, so if the layer is not thick enough, the glaze surface is rough. But if it is too thick, then suspended micro-bubble clouding mars underglaze decoration and muddies the warm red color of the body.
The mugs are fired at cone 03 to burn out as much of the body LOI as possible and for extra strength. This is G2931K glaze with the C03DRH firing schedule. The mug on the left was double-dipped, there are enough suspended micro-bubbles to lighten the body color and the extra thickness in the handle recesses and thumb-hold have collected them in large sizes. The glaze on the right is not glassy smooth, but represents the best that can be achieved with this body, glaze and temperature combination.
| Recipes |
G2931K - Low Fire Fritted Zero3 Transparent Glaze
A cone 03-02 clear medium-expansio glaze developed from Worthington Clear. |
| Glossary |
Glaze thickness
Many ceramic glaze benefits and issues are closely related to the thickness with which the glaze is applied. Many glazes are very sensitive to thickness, so control is needed. |
| Troubles |
Clouding in Ceramic Glazes
There a many factors to deal with in your ceramic process to achieve transparent glazes that actually fire to a crystal-clear glass |
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