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WE have already given one Preparation of Tar∣tar in Chap. 15. both for the Calcination of it, and to extract the Salt; and we have largely shewn in Chap. 5. of what importance it is to dry it through∣ly: For that reason we will not repeat it here, but refer the Reader thither.
To make this Calcination, which is easie, Take Tar∣tar in great lumps, the thickest and most shining you can get, blow away all the Powder, then put it in new Earthen Pots upon live Coals, or in a little Fur∣nace, where you must leave it till it smoaks no more, and all its humidity be exhaled, and it be reduc'd in∣to Lumps of a black purplish colour; then it is cal∣cin'd and well prepared.
Tartar may also be calcin'd by wrapping it in pie∣ces of brown Paper; then lay a Bed of live Coals, and lay a bundle of it upon them, then another Layer or Bed of Coals, and on them another parcel of Tar∣tar; continue thus to do S. S. S. till all your parcels of Tartar are laid on, observing that the upper Layer be always of Coals; and leave the whole in that State till the Tartar be well calcined and leaves off smoak∣ing; then take it off and blow away the Ashes.