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Tile  is the art of fire and soil, but not everyone knows this art, it is because a lot of people do not understand it, so it makes the  ceramic  industry terminal misread it, so, tile this thing is really so difficult to understand? In fact, the following is a brief introduction to recognition method by the naked eyes, so that ordinary people can also be a professional tile’s people. General good  tiles  in the burning of the raw material in addition to the raw material except the impurities, but also with a high magnetic field bar to remove the iron, so removal of impurities, iron removal is a key step in the tile. Cheaper  ceramic tiles : the color of the back is deeper, the color is uneven, and there are uneven black spots because of removing impurities and removing iron. Special attention: very white and very cheap  floor tiles  should be vigilant, because it is possible to add chemical auxiliary materials, zirconium silicate,...