Fig. 7From: Copper alloy production in the Warring States period (475-221 BCE) of the Shu state: a metallurgical study on copper alloy objects of the Baishoulu cemetery in Chengdu, ChinaDiagram for the trace elements As versus Sb (a; on the left) and Ag versus Ni (b; on the right); all data were given in mass percentBack to article page