Check the outer packing box for plant name, site and product name, specification, grade, quantity, trademark, date of production and standard of execution. Check that there is no factory certificate, the product is damaged, the box in the number of products, quality and the contents of the package is consistent. Good quality glazed tile should be smooth, delicate, shiny crystal bright, matt Glaze soft and comfortable. In sufficient natural light or fluorescent lamp irradiation, the brick will be placed in the distance of 1 meters vertical observation, should not see the obvious glaze defects, the product is colorless to poor.