But of the
differing Colours which by differing wayes and working of Quick Silver with
Fire, and Saline Bodies, may be produc'd in Precipitates, I may elsewhere
have occasion to take further notice. I also told you not long since, that
if you corrode Quick-silver with Oyl of Vitriol instead of _Aqua-fortis_,
and abstract the _Menstruum_, there will remain a White _Calx_ which by the
Affusion of Fair Water presently turns into a Lemmon Colour. And ev'n the
_Succedaneum_ to a _Menstruum_ may sometimes serve the turn to change the
Colours of a Metal. The lovely Red which Painters call Vermillion, is made
of Mercury, which is of the Colour of Silver, and of Brimstone which is of
Kin to that of Gold, Sublim'd up together in a certain proportion, as is
vulgarly known to Spagyrists.
_EXPERIMENT XLVIII._
The third chief sort of the Adventitious Colours of Metals, is, that which
is produc'd by associating them (especially when Calcin'd) with other
fusible Bodies, and Principally Venice, and other fine Glass devoid of
Colour.
I have formerly given you an Example, whereby it may appear, that a Metal
may impart to Glass a Colour much differing from its own, when I told you,
how with Silver, I had given Glass a lovely Golden Colour.
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