Misglaze

Misglaze is a term used in ceramics to describe glaze surfaces that have been applied or fired incorrectly, resulting in surface defects or finishes that diverge from the intended appearance. It can refer to glaze that fails to adhere properly to the ceramic body, glaze that is unevenly distributed, or glaze that develops undesired effects during firing.

Causes and manifestations include incorrect glaze-to-body compatibility, insufficient cleaning of the bisque, surface contamination (such as oils or dust), improper glaze thickness, and firing errors (temperature, rate of rise, or atmosphere). Common defects associated with misglaze include crawling (glaze pulls away from the surface), running or drips, pinholes or blisters, crazing (fine cracks in the glaze), and inconsistent color or gloss.

Prevention and handling focus on testing and control. Use test tiles to assess glaze fit with the clay body and adjust a glaze recipe, thickness, or firing schedule as needed. Ensure the bisque is clean and dry, apply glaze evenly by dipping, brushing, or spraying, and maintain consistent kiln conditions. Proper storage and handling of glazes and adherence to manufacturer guidelines help reduce misglaze risks.

Etymology and usage notes: The word misglaze combines mis- with glaze, signaling an incorrect glaze application or firing. In practice, the term is used by potters and ceramic technicians to distinguish glaze-related defects from other surface issues, and it underscores the importance of compatibility among glaze, clay body, and firing process.