The works of the highly experienced and famous chymist, John Rudolph Glauber

by Johann Rudolf Glauber

When the Furnace is thoroughly heated, and that ’tis now time to begin the Cementation, the top of the Furnace is to be shut with its Cover, that the heat may be forced to pass through the Pipe into the Receiver. Having so done, you are to fill an Iron Spoon or Ladle of your prepared Lead-ashes, and put them into the Furnace at the fore-hole which serves for the throwing in your Coals, the which ashes are to be so put in as to cover the Coals over, but not so as to choke them but that they may have air enough to burn, and that the fire be not put out, but doe just in that manner as you are wont to distil the Spirit of Salt. By this means all the Spirits that remained yet behind in the Lead-ashes, will betake themselves into the Receiver, and the Ashes of the Lead will be bettered by the graduating and tinging spirits, and will part of them be reduced into a body, and part will yet retain the form of ashes, and fall down through the Grate to the bottom of the Furnace. Then the Furnace is to be again filled with Coals, and more Ashes are to be put thereon with a Spoon as afore, and this labour is to be continued so long till all the Ashes are consumed.

All the labour being finished, take out your Ashes together with the lead reduced into a body, melt them in the Furnace which is called Stichofen, they will melt wondrous easie, then put some small part thereof to the Test, thereby to try whether or no they are enriched enough, to be turned into a Litharge and undergoe the metallick separation.

If they won’t as yet brook the trial, let the Lead be again turned into Ashes in your Iron Pot, and repeat the whole afore prescribed labour, and that so often till at length the Lead be rendred rich enough in Gold and Silver, the which may be converted into Litharge after the usual manner, and separated from the Gold and Silver. The Litharge being taken away, and gathered together, and broken in a Mill, serves for farther uses in this operation. The Regulus of the Gold and Silver that is left upon the hearth is to be taken out and to be farther mundified in a Cupel after the accustomed way.

This is that more compendious incineration and reduction of Lead, which kind of bettering it, enricheth the operators with Gold and Silver.

N. B. That in this Cementation the sharp spirits do carry over with them some of the Volatile Lead into the Receiver, and there it settles to the bottom; the which powder being freed from all the Acrimony of the spirits by due washings, and being then dried, may be used to all such intents and operations to which the Mercury of Saturn is wont to be used, and which is made by dissolving the Lead in Aq. Fortis, and precipitating it by Salt-water.

N. B. This distilled Mercury hath more hidden under it than the other hath; for it carries hidden in it a Volatile Gold, which may be separated from it and improved about the gradation and Tincture of other Metals, and that with no small profit, concerning which we will say more afterwards.

Thus, friendly Reader, hast thou my more compendious incineration and reduction into better Metals; the which I would not hide from thee, and hereby shall I satisfie those to whom the way prescribed in my Appendix is too tedious and laborious and they may make use of this way instead of that other, which withall is easier and will without all doubt yield more Gold and Silver than that other way.

VIII. Another emendation or bettering of Lead by the graduating extractions of coloured Flints.

Extract either coloured Flints, such as have in them Volatile Gold or Sand or Clay, by the spirit of Salt or Aq. Regis, and draw off the Liquor by Distillation. If you thereto add Salt afore their extraction the dissolvent will receive encrease from the Salt, especially if done in such an instrument, in which a great quantity of extracted matters may be abstracted in a few hours, without either Cucurbits or the other commonly known distilling Vessels, and the same operation may be continued a long while. By this means, there is not onely the least loss of your dissolvent, but it rather gets no small encrease from the Salt. By this instrument also, thou maist not onely prepare great store of sharp spirits necessary for thy operation at the beginning, but likewise commodiously extract your Minerals, and separate the dissolvent again from the Minerals so extracted, so that you shall not lose the least particle of your dissolvent.

But forasmuch as all the Gold, Silver, and Copper may much easier be separated from its Menstruum, by this so unheard of and never seen instrument, than by the way of precipitation, ’tis altogether better and safer for a Man not to precipitate his extracted Metals, but rather draw off the Menstruum from them, that so he may have them dry. And though that all the spirits go not wholly off, so as that nothing of them abide with the Metals, yet they do no hurt, but rather exalt the Litharge that is put unto them into an higher degree, as it also does to the Ashes themselves of the Lead, when they are cemented together in the afore described cementing Furnace; in which Cementation the Volatile Gold is, together with the corporal Gold conserved, and which otherwise would vanish away in the common melting Fire.