Electric carving gravure is first in the copper surface electric carving, chromeplate, and then after grinding.
电雕不凸版,是先在铜暗地电雕,后举行镀铬,再经研磨加工而不败。
2
Carving stone replaced copper to be the major material since Ming Dynasty (about15 th century).
自明代(5世纪),石材取代了铜材,成为治印主要材料。
3
In ancient, copper was adopted as the major chop material. Carving stone replaced copper to be the major material since Ming Dynasty (about15 th century).