Ceramic tile is made up of sand, natural products, and clays and once it has been shaped and dried it is then fired in a kiln. Ceramic tile can be used in its unglazed form. The color range is limited to the natural shades of the clay itself which is typically a red or terra cotta color. Most consumers use glazed ceramic tile. This is done by applying a glaze then firing the tile a second time. Ceramic is designed only for indoor use only.