small
Parcel of a third Body, that has no Colour of its own, (lest some may
pretend I know not what Antipathy betwixt Colours) this otherwise permanent
Colour will be in another trice so quite Destroy'd, that there will remain
no foot-stepts either of it or of any other Colour in the whole Mixture.

The Experiment is very easie, and it is thus perform'd: Take good common
Sublimate, and fully satiate with it what quantity of Water you please,
Filtre the Solution carefully through clean and close Paper, that it may
drop down as Clear and Colourless as Fountain water. Then when you'l shew
the Experiment, put of it about a Spoonfull into a small Wine-glass, or any
other convenient Vessel made of clear Glass, and droping in three or four
drops of good Oyl of Tartar, _per Deliquium_; well Filtred that it may
likewise be without Colour, these two Limpid Liquors will in the twinkling
of an Eye turn into an Opacous mixture of a deep Orange Colour, which by
keeping the Glass continually shaking in your hand, you must preserve from
setling too soon to the Bottom; And when the Spectators have a little
beheld this first Change, then you must presently drop in about four or
five drops of Oyl of Vitriol, and continuing to shake the Glass pretty
strongly, that it may the Nimbler diffuse it self, the whole Colour, if you
have gone Skilfully to work, will immediately disappear, and all the Liquor
in the Glass will be Clear and Colourless as before, without so much as a
Sediment at the Bottom. But for the more gracefull Trial of this
Experiment, 'twill not be amiss to observe, First, That there should not be
taken too much of the Solution of Sublimate, nor too much of the Oyl of
Tartar drop'd in, to avoid the necessity of putting in so much Oyl of
Vitriol as may make an Ebullition, and perhaps run over the Glass.
Secondly, That 'tis convenient to keep the Glass always a little shaking,
both for the better mixing of the Liquors, and to keep the Yellow Substance
from Subsiding, which else it would in a short time do, though when 'tis
subsided it will retain its Colour, and also be capable of being depriv'd
of it by the Oyl newly mention'd. Thirdly, That if any Yellow matter stick
at the sides of the Glass, 'tis but inclining the Glass, till the clarify'd
Liquor can wash alongst it, and the Liquor will presently imbibe it, and
deprive it of its Colour.

Many have somewhat wondred, how I came to light upon this Experiment, but
the Notions or