All these are signs of poor -quality goods.

Having sorted out the marking and choosing more suitable from many options, you need to closely consider the tile itself. Its surface must necessarily be smooth, smooth, and also do not have cracks, chips, otterblin, foreign inclusions, and bulges. All these are signs of poor -quality goods. If you attach two tiles to each other the front sides, then ideally there should not be the slightest glee between them.