out of an Epistle written by Doctor
Kufflerus.


Kufflerus: Artist, I found-in my
own Laboratory, an Aqua-fortis.
Secondly, I again found another
in the Laboratory, Caroli de Roy;
this Aqua-Fortis I poured upon the
Calx of Sol, prepared of Gold, in
the Vulgar manner, and after the
third Cohobation, it sublimed the
Tincture of Gold with it self in the
Neck of the Retort; this Tincture
I mixed with Silver, precipited in
the vulgar manner, and I saw that
one ounce of the sublimed Tincture
of Gold, with ordinary Flux in a
Crucible, had transmuted one
ounce, and halfe of the two ounces
of precipitate Silver, into the best
Gold: but a third part of the Silver
yet remaining, was a white and
fixed Gold: the other two parts
thereof were perfect Silver, fixed
in every examen of Fire. This is
my experience, after this time, we
could never find the like Aqua-fortis.
I Helvetius saw this Gold
white, and without Tincture.