For having purposely Sublim'd together Equal parts (or
thereabout) of Sal-Armoniack and Sublimate, first diligently Mix'd, the
ascending Flowers being diffolv'd in fair Water, and Filtred, gave a
Solution Limpid and Colourless, like that of the other Sublimates, and yet
an _Akaly_ drop'd into this Liquor did not turn it Yellow but White. And
upon the same Grounds we may with _Quick-silver_, without the help of
common Sublimate, prepare another sort of Flowers dissoluble in Water
without Discolouring it, with which I could likewise do what I newly
mention'd; to which I shall add, (what possibly you'l somewhat wonder at)
That so much does the Colour depend upon the Texture resulting from the
Convention of the several sorts of Corpuscles, that though in out
Experiment, Oyl of Vitriol destroys the Yellow Colour, yet with
_Quick-silver_ and fair Water, by the help of Oyl of Vitriol alone, we may
easily make a kind of Precipitate of a fair and permanent Yellow, as you
will e're long (in the forty second Expement of this third Part) be taught.
And I may further add, that I chose Oyl of Vitriol, not so much for any
other or peculiar Quality, as for its being, when 'tis well rectify'd,
(which 'tis somewhat hazardous to bring it to be) not only devoid of Colour
and in Smells, but extremely Strong and Incisive; For though common and
undephlegmated _Aqua-fortis_ will not perform the same thing well, yet that
which is made exceeding Strong by being carefully Dephlegm'd, will do it
pretty well, though not so well as Oyl of Vitriol which is so Strong, that
even without Rectification it may for a need be made use of.
Pages:
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287