halfglaze

Halfglaze is a ceramic technique in which glaze is applied to only a portion of a ceramic object, producing a surface with contrasting glazed and unglazed areas. The term encompasses intentional partial glazing during finishing as well as effects created by masking or selective application. It is valued for emphasizing form, edge lines, handles, rims, or decorative motifs, and for creating a two-tone surface without altering the overall shape of the piece.

Techniques include masking areas with wax resist, tape, or wax; brushing glaze onto selected regions; or dipping the piece so that only the upper portion becomes glazed. After firing, the glazed area takes on the glaze’s surface and color characteristics, while the unglazed portions retain the inherent texture of the clay body, which can provide grip or a matte counterpoint to the glaze.

Considerations involve glaze compatibility and fit with the clay body, as improper matching can cause crazing or flaking. Edge control is important to prevent glaze from creeping onto unintended areas, and glazes may pool or run at rims, affecting appearance and function. For functional wares, leaving areas unglazed can influence water absorption and cleaning; for decorative wares, the contrast is primarily aesthetic. In contemporary practice, halfglaze is used to achieve modern, restrained designs, while historical pieces may employ it to highlight form and technique.

Safety and quality rely on using appropriate, food-safe glazes for functional items and following standard firing and handling guidelines.