The
Solutions of Mercury in _Aqua-fortis_ are not generally taken notice of, to
give any notable Tincture to the _Menstruum_; but sometimes when the Liquor
first falls upon the Quick Silver, I have observ'd a very remarkable,
though not durable, Greenness, or Blewness to be produc'd, which is a
_Phaenomenon_ not unfit for you to consider, though I have not now the
leisure to discourse upon it. Tin Corroded by _Aqua-fortis_ till the
_Menstruum_ will work no farther on it, becomes exceeding White, but as we
elsewhere note, does very easily of it self acquire the consistence, not of
a Metalline _Calx_, but of a Coagulated matter, which we have observ'd with
pleasure to look so like, either to curdled Milk, or curdled Whites of
Eggs, that a person unacquainted with such Solutions may easily be mistaken
in it. But when I purposely prepar'd a _Menstruum_ that would dissolve it
as _Aqua-fortis_ dissolves Silver, and not barely Corrode it, and quickly
let it fall again, I remember not that I took notice of any particular
Colour in the Solution, as if the more Whitish Metalls did not much Tinge
their _Menstruums_, though the conspicuously Colour'd Metalls as Gold, and
Copper, do. For Lead dissolv'd in Spirit of Vinegar or _Aqua-fortis_ gives
a Solution cleer enough, and if the _Menstruum_ be abstracted appears
either Diaphanous or White.
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