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MElt ♄ in an Iron pan, let it be red-hot, then cast in some Salt, stir it until it be reduced to Powder; sift this Powder finely, and that which will not go through the size, must be Calcined as before: Then edulco∣rate this Powder with warm {water}, and you shall have a Calx as white as Ceruse, which put into a Matrass, and extract the Salt out of it with distilled Vinegar s. a. after three
or four days digestion, decant the distilled Vinegar, and put on fresh; digest as before, shaking the Vessel often: Repeat this three or four times, or so often, till the Sp. of V. hath extracted all the Salt. Then put all your Sp. of V. together and filter it, then distill it off in a Retort, until you see the Salt of ♄ remain in the bottom like deep-red Oyl, which being cold, will be white like Sugar-candy: Grind this Salt, and put it into a Matrass, and extract it with Sp. of V. as before. Repeat this purification three or four times, and you shall have a Salt of ♄ well prepared for this Work.