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IT hath a power of Precipitating, as other Volatile Spirits, most Bodies dissolved in Acid Menstruums; I say most, because there is no need this rule should be general, or hold when the Body is of such a Nature, that it may be as well dissolved by an Acid as an Alkaly; and that there are such Bodies appears, since Spirit of Human Blood will dissolve both Cop∣per and Zink, which may be likewise dissolved by Aqua Fortis and other Acid Menstruums.
But that this Spirit will precipitate other Bodies dissolved in Acid Menstruums, I am con∣vinced by several tryals made on red Lead dissolved in Vinegar, Silver in Aqua Fortis, Gold in Aqua Regia, and Tin dissolved in an appropriated Menstruum, and several other Bodies. And out of a Solution of common Salt made in Water, we could readily precipitate with the Spirit of Blood, a Substance which looked like a white Earth, and such a Sub∣stance I obtained in a far greater quantity, from that which the Salt-makers call Bittern, which usually remains in their Salt Pans, when they have taken out about as much Salt, as would coagulate in figured grains. This Spirit of Human Blood does likewise precipitate a Solu∣tion of Dantzik Vitriol in Water, but that Solution is not a total one.