Unglazed

Unglazed refers to a surface that has not been coated with a glaze. In ceramics, glazes are glassy, non-porous coatings fused to the surface, while unglazed pieces retain the natural texture and porosity of the clay body.

The appearance of unglazed wares is influenced by the clay used and the firing process. Colors are typically the native tones of the clay, such as red terracotta, brown stoneware, or pale clay bodies. Finishes range from rough and rustic to smooth and matte, and unglazed surfaces are common in items like terracotta pots, architectural tiles, and certain sculptures.

Manufacturing and use vary. Unglazed wares are produced by shaping the clay and firing it to maturity without applying a glaze afterward. Some pieces are bisque-fired and later glazed, while others are intentionally left unglazed for aesthetic or practical reasons. In tiling and architectural applications, unglazed ceramic tiles emphasize a natural look and offer slip resistance due to their texture.

Properties and care are driven by porosity. Unglazed surfaces absorb water and other substances more readily than glazed surfaces, making them more prone to staining and moisture-related damage. Cleaning typically requires gentle methods to avoid altering the surface, and many users apply penetrating sealants to reduce absorbency, recognizing that sealants can affect appearance and breathability.

In modern design, unglazed surfaces are valued for their tactile texture, earthy tones, and raw aesthetic. They appear in pottery, sculpture, bricks, roofing tiles, and various interior finishes where a natural, non-glossy look is desired.