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Definition. A hard ceramic tile of homogeneous composition throughout, deriving its color or texture from the materials used and the method of manufacture. The unglazed tile is used for floors or walls.Print | Cite This Source | Link to This Page. hard ceramic tile of homogeneous composition throughout, deriving its color or texture from the materials used and the method of manufacture. The unglazed tile is used for floors or walls.
Underglaze is the opposite of overglaze. It refers to ceramic decoration that lies under the glaze, which forms a protective layer. The technique only became possible in Europe when biscuit firing was introduced for fine earthenwares and porcelain (see B is for Biscuit) .