Ceramic tiles come to two basic constructions, glazed and unglazed. The body of ceramic tile (called: bisque) may be coated with a glaze or without depending on its intended purpose.
Glazed
The glaze is made up of coloured glass and applied and baked to the surface of the bisque under very high temperatures. Glazed ceramic tiles are a great choice for bathrooms, kitchens, walls and countertops. Glazing helps make ceramic tiles resistant to stains, scratches, fire, sunlight and slips. If a tile does get scratched or chipped, the under-colour will show through and the tile may need to be replaced.
Unglazed
The colour of the bisque is the same all the way through the tile, so if a tile gets scratched or chipped it will not be as noticeable as with glazed tiles. Depending on the type of unglazed tile, you may need a special sealer.
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