Dissolve any metal (excepting Silver, which must be dissolved in Aqua fortis) in the strongest spirit of Salt, and draw off the flegme in Balneo; to that which remains pour the best rectified spirit of Wine, put it to digesting, untill the Oyle be elevated to the top as red as blood, which is the tincture, and quintessence of that metal, being a most Precious treasure in medicine. _A sweet and red Oyle, of Metals and Minerals._ Dissolve a Metal or Mineral in spirit of Salt, dissolve also an equal weight of salt of Wine essentificated; mix these dissolutions, and distill them by retort in a gradual heat, and there will come out an oyle sweet, and as red as blood, together with the spirit of Salt; and sometimes the neck of the retort and receiver will be coloured like a Peacocks tail with divers colours, and sometimes with a golden colour. And because I would without any difference comprehend all Metals and Minerals under one certain general process; let him that would make the essence of silver take the spirit of nitre, and proceed in all things as was spoken of the other metals. Concerning the use of these essences, I need not speak much thereof; for to him that knows the preparation shall be discovered the use thereof. Concerning the corrosive oyles of metals and minerals, seeing they cannot be described by any one process, it will be worth while to set down what is peculiar to each of them, as followeth. _The Oyle, or Liquor of Gold._ Dissolve the calx of gold in the spirit of salt, (which must be very strong, or else it cannot dissolve it) but in defect of the strongest spirit thereof, mix a little of the purest salt-peter; but that oyle is the best which is made with the spirit of salt alone. From the gold dissolved abstract half the solution, and there will remain a corrosive oyle, upon which pour the expressed juice of lemons, and the dissolution will become green, and a few feces fall to the bottom, which may be reduced in melting. This being done, put this green liquor in Balneo, and draw off the flegme: that which remains take out, and put upon a marble in a cold moist place, and it will be resolved into a red oyle, which may safely, and without danger be taken inwardly, curing those that are hurt with Mercury. But especially it is commended in old ulcers of the mouth, tongue, and throat, arising from the French pox, leprosy, scorbute, _&c._ where the oyl of other things cannot be so safely used. There is not a better medicine in the exulceration, and swelling of the glandules, in the ulcers of tongue and jaws, which doth sooner mundify, and consolidate. Neither yet must we neglect necessary purgings, and sudorificks, for fear of a relapse, the cause not being taken away.