Take a strong lixivium made of unslaked lime, and evaporate it.
Whereas you would expect to find a salt at the bottom, there is none, for all the salt in the lixivium is vapored away, and the more the liquor is evaporated the weaker the lixivium becomes, which is contrary to other lixiviums. Also, if you take the spirit of vinegar and evaporate it, you shall find no salt at the bottom. Now, if you take the clear lixivium of lime and spirit of vinegar, of each a like quantity, and mix them together and evaporate the humidity thereof, you shall find a good quantity of salt at the bottom which tastes partly hot and partly acid. This salt, being set in a cold cellar on a marble stone and dissolved into an oil, is as good as any lac virginis to clear and smooth the face and dry up any hot pustules in the skin, as also against the itch and old ulcers to dry them up.
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