The Chinese early learned to work in metals; bronze occurs in the 11th-10th centuries B. C., useful iron from about 500 B. C. At a later period they made brass... True porcelain was first made about A. D. 600. They were probably in possession of mercury at an early date, and learnt how to decompose cinnabar into mercury and sulphur, and recompose it from these materials.
A Short History of Chemistry (1937)