Glazed porcelain and ceramic tiles are made in a similar way. Clay, sand and other ingredients are mixed together, pressed into tile shapes and fired in a kiln at very high temperatures to produce a base tile or ‘biscuit’. A layer of glaze is then applied to the surface to give the tile its colour or pattern. The main difference between glazed porcelain and ceramic tiles is the ingredients which make up the tile. The ingredients of porcelain tiles make them more dense and less porous than ceramic tiles, and they are therefore more hard wearing and suitable for both floors and walls. Due to their low water absorption, some porcelain tiles are also suitable for outdoor use, whereas ceramic tiles are suitable for indoors only. Through bodied porcelain tiles are made using a similar method but instead of having a glaze applied to the surface of the tile, the colour or pattern forms part of the body of the tile due to the mixture of ingredients. This makes them even more hard wearing than glazed tiles as there is no glaze to wear away, and in the unlikely event that a tile does become chipped, the visible tile underneath will be the same colour as the surface so it won’t be as noticeable. Through bodied porcelain tiles can be left matte or polished to give a very shiny surface.