《天工开物·下篇·五金》
每次红铜六斤，配锌四斤，先后放入罐里熔化，冷却后取出即是黄铜，供人们打造各种器物。
每红铜六斤，入倭铅四斤，先后入罐熔化，冷定取出，即成黄铜，唯人打造。
Six catties of red copper each time, with four catties of zinc, were put into the pot and melted one after another. After cooling, the brass was taken out, which was used by people to make various utensils.