The fine fluidity in the process of casting had a direct bearing on the surface effects of the cast. In 1993, in cooperation with No. 621 Research Institute of the Ministry of Aerospace Industry, we made another test of the alloy ingredients of the Yongle Bell, including the trace elements. We obtained new data. For the first time we found that besides copper, tin, lead, zinc, aluminum, iron and magnesium, the big bell contained gold and silver. The gold was good for resisting rust and corrosion, and the silver enhanced the fluidity of casting fluid.
