A clear, resonant sound indicates good quality; on the other hand, if the sound is dull and muffled, it is of inferior quality.
他提出鑑別的要點：「好壺不容有瑕疵，有的缺陷可用肉眼觀察出來，有的則否。可輕敲茶壺各部位，若有地方聲音有異，感覺特別沉悶，恐怕就是有裂縫或其他瑕疵。