The tonality represents the color bath number.From one production to another, the tile to be manufactured may turn out slightly lighter or darker, slightly cooler or warmer and so on. These different parties and productions therefore have a different tonality. We recommend that you do not place tiles of different tonalities. For a product with a lot of nuance or flame, this will be less noticeable, but for a plain or nearly plain tile, the tonality or color bath will be most noticeable. Sometimes the difference is not visible when we look straight at the tile, but the tile gets a different effect when backlit