LINDA BLOOMFIELD

ALKALINE GLAZES

laze materials can be categorised according to their alkalinity or acidity. This helps us to understand how they interact when melted in the kiln. All glaze fluxes are alkaline, but some are more alkaline than others. Sodium, potassium and lithium are very reactive alkali metals. When they react with water, they make highly alkaline, caustic solutions. They are used in their insoluble form as soda or potash feldspar in stoneware glazes, where they act as the primary