(1) Seals cut as works of art should excel in three aspects-- calligraphy, composition and the graver 's handwork.(2) It's easy enough to draw a curved line with a pen or on an engraving plate with a graver .(3) A blow struck at a specific weak point along the blade, that is, at a notch, would achieve a consistent break and a characteristic triangular end that could be subsequently retouched into a formal graver .(4) Lines are cut into a metal plate using a tool called burin or graver .(5) It is clear from illustrations in that report, however, that formal blade tools such as gravers and drills occur in that assemblage.(6) Other tools, such as scrapers, gravers , drills, and notched flakes, accounted for only 4 percent of the formal artifacts.
