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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.
Underglazes are applied to the surface of the pottery, which can be either raw, greenware, or  biscuit -fired (an initial firing of some articles before the glazing and re-firing). A wet glazeâusually transparentâis applied over the decoration.