NOT KNOWN FACTS ABOUT JOHN TANG EPOCH

Some of ther efforts contributed to the invention of new steel alloys, porcelain items, and new dyes. The historian Joseph Needham labeled the operate on the Daoist alchemists as "proto-science rather then pseudo-science." Nathan Sivin disputes the close link involving Daoism and alchemy, arguing that alchemy was just as well known (if no more so)