印石中的“三贱”即粗、松、脆。粗:指印石构成的颗粒粗糙,包括呈干粉状的“死灰点”(犹如古玉上的钙化斑点,刻之即剥落)、干涩的“甘蔗渣点”以及肌理内混杂异物(如围岩、马牙石、砂、钉等)。质粗的印石多 India stone in the “three cheap” that rough, loose, brittle. Rough: refers to the rough stone particles, including the dry powdery “dead gray spots” (like the ancient jade calcification spots, the moment of the peel), dry “bagasse point ” and the texture mixed foreign matter (Such as wall rocks, horse teeth, sand, nails, etc.). Quality thick stone and more