Ancient times guarded against corrosion the case

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In the Chinese ancient times, in the rivers and lakes spread the quitebroad one kind of secret technique is takes poison on own initiative,in just before the end the front several months, persisted the smalldosage took poison and so on white arsenic and mercury, like this, inthe body accumulated the toxin could play after dying prevents themortal body rotten role. Concerned Fang Fuzhei the aspect theory, didnot know has a more ancient discovery?