These square seals , carved in intaglio with geometric or animal motifs , served as economic documentation 这些阴刻了几何或动物图案的方形图章,具有经济凭证的作用。
7.
In the 20th century a number of security features , ranging from embedded metal threads to intaglio printing , came into use 到了20世纪,由内藏保安线以至凹版印刷技术等防伪方法也陆续面世。
8.
An introduction to various printing types : intaglio , relief printing , planography , serigraphy and mixed media printing approx 介绍多种版画的制作方法,分别为凹版凸版平版孔版及综合版。
9.
In the 20th century a number of security features , ranging from embedded metal threads to intaglio printing , came into use 到了20世纪,由内藏保安线以至凹版印刷技术等防伪方法也陆续面世。