And to manifest, _Pyrophilus_, that Galls are not so requisite as many
suppose to the making Atramentous Liquors, we have sometimes made the
following Experiment, We took dryed Rose leaves and Decocted them for a
while in Fair Water, into two or three spoonfulls of this Decoction we
shook a few drops of a strong and well filtrated Solution of Vitriol (which
perhaps had it been Green would have done as well) and immediately the
mixture did turn Black, and when into this mixture presently after it was
made, we shook a just Proportion of _Aqua Fortis_, we turn'd it from a
Black Ink to a deep Red one, which by the affusion of a little Spirit of
Urine may be reduc'd immediately to an Opacous and Blackish Colour. And in
regard, _Pyrophilus_, that in the former Experiments, both the Infusion of
Galls, and the Decoction of Roses, and the Solution of Copperis employ'd
about them, are endow'd each of them with its own Colour, there may be a
more noble Experiment of the sudden production of Blackness made by the
way mention'd in the Second Section of the Second Part of our Essays, for
though upon the Confusion of the two Liquors there mention'd, there do
immediately emerge a very Black mixture, yet both the Infusion of
_Orpiment_ and the Solution of _Minium_ were before their being joyn'd
together, Limpid and Colourless.
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