For there is this
difference betwixt the following Experiment, and most of the others
deliver'd in these Papers, that in this, the Colour that a Body already
had, is not chang'd into another, but betwixt two Bodies, each of them
apart devoid of Colour, there is in a moment generated a very deep Colour,
and which if it were let alone, would be permanent; and yet by a very 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.
Pages:
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283