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underglaze decorationsee decoration, underglaze. unglazed paver tile. see pavers.
  
unglazed quarry tilesee quarry tile.
  
unglazed tilea hard, dense tile of homogeneous composition throughout, deriving color and texture from the materials of which the body is made. the colors and characteristics of the tile are determined by the materials used in the body, the method of manufacture, and the thermal treatment.