Look at the trademark
Be sure to look at the bottom of the brick and see if there is a Louis Modern trademark on the package.
Look at the appearance
Look at the appearance is a good tile flatness, smooth surface.
Listen to the sound.
Tap the middle and lower part of the tile with a hard object or right index finger, and the sound is crisp and pleasant, and vice versa.
Check the speed of water dispersion.
Three drops of water are dripping on the back of the tile, depending on the speed of soaking after the water is dispersed. If the speed is slow, it means that the tiles are dense and of good quality, and vice versa.
measure with a ruler
Measuring with a ruler is the key to judge the quality of ceramic tiles. The diagonal and four-sided dimensions and thickness of a good ceramic tile measured with a tape measure or caliper are consistent.