How to know Polished selection method?
2010-10-24Light with a hard object hit brick.Sound more crisp, the higher the glass, the better the quality.Can also be left thumb, index finger and middle finger grip tile corner, easily dropped, with the right index finger tap in the lower part of tile, if the sound is clear, and pleasant to the high-quality, if the sound is dull, stagnant cloud is poor quality.
Tile, polished to a good hardness, toughness, non-friable bad is superior.Angular fragments of tiles each with scratches, marks off shards view is that tight or loose, is brittle, hard or loose, soft, is leaving scratches, or scattered powder, in the case of the former that the latter is a good difference.
