The imprint of chalcography by the methods of graving, itching, pressing and scratching is very different from other kinds of printmaking.
铜版画中通过“刻，蚀，压，刮”等方法产生的痕迹有别于其他版种。
2
The mineral character, the mineral arisen sequence and the relation of mineral intergrowth are studied by mineralogy, chalcography, chymic analysis and EPMA, etc.