Outside the Dan surgery
Outside the Dan or alchemy is a Chinese Taoist cultivation methods, but also the embryonic form of chemistry. At the same time it also has a great impact on traditional Chinese medicine. Outside rhyme, including albite, that is, alchemy. The first through the refining of lead, mercury and other drugs to produce immortal immortality. Began to call the saver, and later in order to distinguish with the inner alchemy, and called the outer Dan. I believe that people outside the Dan surgery that Dan sand can be repeated changes, gold can be permanent, so they made with the immortality, eat can be immortal. Refining the alien, is through a variety of secret law, cooked into immortality, used to take, or directly take some Zhicao, to point their own yin, so that into yang. In addition, the Taoist alien can also refer to the "empty in the clear spirit of the gas", modern Chen 撄 Ning cloud: "external funding, of course, is essential, but it is seeking in the void." "Cultivation who, expensive in the collection of empty in the clear spirit The gas in the body, and then my god and the gas with the cultivation of the past, for a long time, then the air into one, and the big Dan began.