Clay tiles are fired in a kiln, but if they need to be coated with a glaze, that coating must be applied before placing the tiles in the kiln. The glaze is infused into the tile's top layer of clay during the firing process. However, if the tile is not coated before being fired, it is referred to as an unglazed tile. In this approach, the coating on the tiles serves as the primary distinction between glazed and unglazed tiles. Unglazed tiles, whether made of porcelain or ceramic, receive their color from the clay they are constructed of, either naturally or by the addition of pigments.
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