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TAke equal parts of Tartar and Quick∣lime, powder them, and mix them well together, put this in a Pot, cover it close, and put it in a Potters Oven when he burns his Pots; then make a Lixivium of it with Rain {water}, which filter and evaporate to dry∣ness,
mix this Salt again with the same quan∣tity of Quick-lime, and Calcine it in a Pot∣ters Oven as before. Repeat this five or six times; then dissolve this Salt in distilled Vi∣negar, distill and cohobate so often, till it will no more congeal into a Salt, but that it remain like melted Wax in the bottom, which pour out, and keep it for Use.