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(1) drop a few drops of tea juice or water on the back of the ceramic tile, and wait for a few minutes, depending on the extent to which the water droplets are inhaled and diffused, the quality is good if they do not absorb water or have a low water absorption rate.
(2) knock ceramic tile to listen to sound crisp, sound more brittle, porcelain degree, density higher, hardness better.
(3) whether there are scratches on the ceramic tile with sharp objects, if there are scratches, it indicates that the surface hardness is not enough, after the surface glaze is polished, the brick surface will be dirty and cannot be cleaned.
(4) the color, chromaticity is clear, natural person of ceramic tile, show vitrification degree is high, chromaticity is not clear, vitrification degree is low.