Fig. 14From: 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, ChinaLead isotope ratios plotted against 1/Pb for bronzes of the Warring States period. a206Pb/204Pb versus 1/Pb; b 207Pb/204Pb versus 1/Pb; c208Pb/204Pb versus 1/PbBack to article page