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But if you further continue the Calcination till you have perfectly Incinerated the Tartar, & kept it long enough in a Strong fire, the remaining Calx will be White.
This decantation and pouring on continue so long till all the Calx of Saturn be dissolved, then take all the dissolved Saturn, set it in a Bath, evaporate the Vinegar by a small fire, the Saturn will become a powder or lump.
Wherefore take one part of the Oil, or half an Ounce of Saturn, four Ounces calcined according to Art, pour the Oil upon the Calx of Saturn, mixing it, set it ten daies and nights in the heat, into the secret Furnace; every two days augment the fire one degree, according to the capacity of the Furnace; after four days and nights set it into the third degree of Fire, therein let it rest three days and nights, then open the Door or Vent of the fourth degree, which must likewise continue three days and nights; afterwards take it out, the Saturn will be above black, like unto Charcole dust, but under this black dust you will find other Colours, throughout pure, red, yellow, which flux with Venetian Borax, you will find it converted into good Gold by the power of our Oil, so have you means again to set forward the great work.
Minerals also by the Action of the Fire may be brought to afford Colours very differing from their own, as I not long since noted to you about the variously Colour'd Flowers of Antimony, to which we may add the Whitish Grey-Colour of its Calx, and the Yellow or Reddish Colour of the Glass, where into that Calx may be flux'd.
I have formerly given you an Example, whereby it may appear, that a Metal may impart to Glass a Colour much differing from its own, when I told you, how with Silver, I had given Glass a lovely Golden Colour. And I shall now add, that I have Learn'd from one of the Chief Artificers that sells Painted Glass, that those of his Trade Colour it Yellow with a preparation of the Calx of Silver.
My Child shall take 10, 12, or 15 pound of Saturn, wherein is no mixture of any other Metal; laminate it thin, have in readiness a great Stone Jugg, half full of Vinegar, stop the Jugg very close, set it in a Lukewarm Bath, every three or four days scrape off the calcin'd Saturn from the Plates, and reserve it apart, thus do so long till you have 5 or 6 l. of the calcin'd Saturn, then grind it very well on a Stone with good distilled Wine-Vinegar, so as you may paint therewith, then take two or three great Stone-pots, therein put the Calx of Saturn which you ground, poure good distilled Wine-Vinegar upon it, that two parts of the Pot be full, stir it well together, stop the Pot close with a polished Glass or Pebble-stone, set the Pots in a Bath, stir it four or five times in a day with a wooden Ladle, lay the Glass or Stone Stopple again over it, make the Bath no hotter than that you may well endure your hand therein, that is, lukewarm; so let it stand fourteen days and nights, then decant that which is clear into another Stone-pot, poure other distilled Vinegar upon the Calx which is not well dissolved, mix them well together, set it 14 days in the Bath, again decant it, and poure other Vinegar upon it as before.
With regard again to the nature of the fire by which the fusion had been produced, he is much mistaken if he imagines that the reduction of the reguline or metallic manganese depends upon the intensity of the heat; it depends upon circumstances proper for the separation of the oxygenating principle from the calx, in like manner as the calcination of calcareous spar must depend upon circumstances proper for allowing the separation of the carbonic acid or fixed air.
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