Twelve Keys — Now follows concerning Sulphur
The original source material is generally attributed to Basil Valentine. Current revision is made from the translation included in ‘The Hermetic Museum’ originally translated by Elias Ashmole and edited by A.E. Waite.
Seek your Mercury in a similar metal. Then when you know how to extract the metal from its body by purification, the destruction of the first Mars, and reverberation, without the use of any corrosive (the method of doing which I have indicated in my Third Key,) — you must dissolve that Mercury in its own blood, out of which it was made before it became fixed (as indicated in the Sixth Key,); and you have then nourished and dissolved the true lion with the blood of the green lion. For the fixed blood of the Red Lion has been made out of the volatile blood of the Green Lion; hence, they are of one nature, and the unfixed blood again renders that which is volatile fixed, and the fixed blood in its turn fixes that which is volatile, as it was before its solution. Then foster it in gentle heat, until the whole of the mercury is dissolved, and you obtain the second ferment (by nourishing the fixed sulphur with that which is not fixed), as all Sages unite with me in testifying. Afterwards this becomes, by sublimation with spirit of wine, of a blood-red colour, and is called potable gold.
al-kemi 
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