rpose
prepar'd anew a while before, because it will not long retain its fitness
for this work, I do but seldome annex this Experiment to the other, yet I
shall tell you how I devis'd it, and how I make it. If you boyl Crude
Antimony in a strong and clear _Lixivium_, you shall separate a Substance
from it, which some Modern _Chymists_ are pleas'd to call its Sulphur, but
how deservedly I shall not here examine, having elsewhere done it in an
Opportune place; wherefore I shall now but need to take notice, that when
this suppos'd Sulphur (not now to call it rather a kind of _Crocus_) is let
fall by the Liquor upon its Refrigeration, it often settles in Flakes, or
such like parcels of a Yellow Substance, (which being by the precedent
dissolution reduc'd into Minute parts, may peradventure be made to take
Fire much more easily than the Grosser Powder of unprepar'd Antimony would
have done.) Considering therefore, that common Sulphur boyl'd in a
_Lixivium_ may be Precipitated out of it by Rhenish-wine or White-wine,
which are Sowrish Liquors, and have in them, as I elsewhere shew, an Acid
Salt; and having found also by Trial, that with other Acid Liquors I could
Precipitate out of Lixiviate Solvents some other Mineral concretions
abounding with Sulphureous parts, of which sort is crude Antimony, I
concluded it to be easie to Precipitate the Antimony dissolv'd, as was
lately mention'd, with the Acid Oyl of Vitriol; and though common Sulphur
yields a White Precipitate, which the _Chymists_ call _Lac Sulphuris_, yet
I suppos'd the Precipitated Antimony would be of a deep Yellow Colour, as
well, if made with Oyl of Vitriol, as if made only by Refrigeration and
length of Time. From this 'twas easie to deduce this Experiment, that if
you put into one Glass some of the freshly Impregnated and Filtrated
Solution of Antimony, and into another some of the Orange-Colour'd Mixture,
(which I formerly shew'd you how to make with a Mercurial Solution and Oyl
of Tartar) a few drops of Oyl of Vitriol dropp'd into the last mention'd
Glass, would, as I told you before, turn the Deep Yellow mixture into a
Cleer Liquor; whereas a little of the same Oyl dropp'd out of the same Viol
into the other Glass would presently (but not without some ill sent) turn
the moderately cleer Solution into a Deep Yellow Substance, But this, as I
Said, succeeds not well, unless you employ a _Lixivium_ that has but newly
dissolv'd Antimony, and has not yet let it fall.