is popularly credited with recognising the detrimental effects of asbestos on human beings, examination of the primary sources reveals no support for either claim.

In China, accounts of obtaining huo huàn bù ??? or "fire-laundered cloth" certainly date to the Wei dynasty (386-535 AD), and there are claims they were known as early as in the Zhou dynasty, though not substantiated except in writings thought to date much later (see huoshu