《天工开物·下篇·五金》
制造乐器用的响铜，要把不含铅的两广产的锡放进罐里与铜同熔。
凡用铜造响器，用出山广锡无铅气者入内。
To make the ringing copper used for making musical instruments, pewter produced in Guangdong and Guangxi which did not contain lead should be put into the pot and smelted together with copper.