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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.
Some hints when using underglaze decorations: 1  Bisque at Cone 05-04 and glaze fire to Cone 06. 2  Lead free clear glazes are best when applied very thin. 3  White underglaze may be used to mute underglaze colors.