l to be so deeply Caeruleous, that it requir'd to be oppos'd to
a very strong Light to appear of any other Colour. I took likewise a Vial
with Spirit of Wine, and a little Salt of Harts-horn, and found that there
was a certain proportion to be met with betwixt the Liquor and the Salt,
which made the Mixture fit to exhibit some little Variety of Colours not
Observable in ordinary Liquors, as it was variously directed in reference
to the Light and the Eye, but this Change of Colour was very far short from
that which we had admir'd in our Tincture. But however, I suspected that
the Tinging Particles did abound with such Salts, whose Texture, and the
Colour springing from it, would probably be alter'd by peircing Acid Salts,
which would in likelihood either make some Dissipation of their Parts, or
Associate themselves to the like Bodies, and either way alter the Colour
exhibited by them; whereupon Pouring into a small Vial full of Impregnated
Water, a very little Spirit of Vinegar, I found that according to my
Expectation, the Caeruleous Colour immediately vanish'd, but was deceiv'd
in the Expectation I had, that the Golden Colour would do so too; for,
which way soever I turned the Vial, either to or from the Light, I found
the Liquor to appear always of a Yellowish Colour and no other: Upon this I
imagin'd that the Acid Salts of the Vinegar having been able to deprive the
Liquor of its Caeruleous Colour, a Sulphureous Salt being of a contrary
Nature, would be able to Mortifie the Saline Particles of Vinegar, and
Destroy their Effects; And accordingly having plac'd my Self betwixt the
Window, and the Vial, and into the Same Liquor dropt a few drops of Oyl of
Tartar _per Deliquium_, (as _Chymists_ call it) I observ'd with pleasure,
that immediately upon the Diffusion of this Liquor, the Impregnated Water
was restor'd to its former Caeruleous Colour; And this Liquor of _Tartar_
being very Ponderous, and falling at first to the Bottom of the Vial, it
was easie to observe that for a little while the Lower part of the Liquor
appear'd deeply Caeruleous; whilst all the Upper part retain'd its former
Yellowness, which it immediately lost as soon as either Agitation or Time
had made a competent Diffusion of the Liquor of _Tartar_ through the Body
of the former Tincture; and this restored Liquor did, as it was Look'd upon
against or from the Light, exhibit the Same _Phaenomena_ as the Tincted
Water did, before either of the Adventitious