● "Look": A look at grades, superior product best, third-class products and substandard goods are worrying; Second, look at the appearance and glazed tile good without bulging, Qiaojiao and other issues, while facing flat glaze smooth surface, no particles or color shades of the phenomenon; Third, look at the pattern, the pattern to be fine, no color leakage, dislocation, disconnection or shades.
● "Listen" To hand thumb, forefinger and middle finger clip tile corner, easily dropped, the other hand index finger tapping in the lower part ofthe tile, such as sound clear, sweet for the top grade, such as sound dull, astringent cloud is defective.
● "Cut" Cut tile fragment (generally observed to have been broken in pieces to the store), see breaks. Breaks dense, hard and brittle, the same color for the top grade.
● "Water" The drop in the back of the tile, the water infiltrating slowly spread tile density, regarded as the top grade.