And if you make the Tincture of Red-roses
very high, and without Diluting it with fair Water, pour on the Spirit of
Urine, you may have a Blew so deep, as to make the Liquor Opacous, but
being dropt upon White Paper the Colour will soon disclose it self. Also
having made the Red, and consequently the Blew Tincture very Transparent,
and suffer'd it to rest in a small open Vial for a Day or two, we found
according to our Conjecture, that not only the Blew but the Red Colour also
was Vanish'd; the clear Liquor being of a bright Amber Colour, at the
bottom of which subsided a Light, but Copious feculency of almost the same
Colour, which seems to be nothing but the Tincted parts of the Rose Leaves
drawn out by the Acid Spirits of the Oyl of Vitriol, and Precipitated by
the Volatile Salt of the Spirit of Urine, which makes it the more probable,
that the Redness drawn by the Oyl of Vitriol, was at least as well an
extraction of the Tinging parts of the Roses, as a production of Redness;
and lastly, if you be destitute of Spirit of Urine, you may change the
Colour of the Tincture of Roses with many other Sulphureous Salts, as a
strong Solution of Pot-ashes, Oyl of Tartar, &c. which yet are seldome so
free from Feculency, as the Spirituous parts of Urine becomes by repeated
Distillation.
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