DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.18732#0041
works to be feen by candle light (as fcerte painting) for
though mixed with much white, it retains its beauty.
There is nothing to be found in the (hops under this
name but common vsrditer^ or fome fpecies of it.
Blue, Prussian, is a modern invention, confiderably
in ufe among painters, though inferior to the ultramarine
blue. It was difcovered by accident, about the begin-
ning of this century. A chemift of Berlin, having fUc-
ceflively thrown Upon the ground feveral liquors from his
laboratory, was furprifed to fee it fuddenly ftained with a
moft beautiful colour. Recollecting the liquors he had
thrown on each other, he made a fimilar mixture in a vef-
fel, and produced the fame colour. He did not publifll
his procefs, but prepared and fold his blue, which was
fubftituted for ultramarine. The account of it was
fir ft publifhed in the Berlin Memoirs, 1710; but with-
out a description of its procefs.
In a paper of Dr. Woodward's, communicated to the
Royal Society in 1724, there is given a fhort way of
making PruJJian blue, which was found to anfwer per-"-
feclly well; and occafioned feveral experiments, whereby
was difcovered the nature of the bodies ufed in that pre-
paration.
The method was this. Four ounces of bullock's
blood dried, and four ounces of fait of tartar, prepared
from four ounces of crude tartar, and as much nitre, were
calcined together; two hours after which, a black fpungy
fubftance remained in the crucible, weighing four
ounces ; a folution of which being made in boiling wa-
ter, and afterwards filtered, left a remainder which when
dried weighed nine drams, An ounce of Englifh vitriol
was
though mixed with much white, it retains its beauty.
There is nothing to be found in the (hops under this
name but common vsrditer^ or fome fpecies of it.
Blue, Prussian, is a modern invention, confiderably
in ufe among painters, though inferior to the ultramarine
blue. It was difcovered by accident, about the begin-
ning of this century. A chemift of Berlin, having fUc-
ceflively thrown Upon the ground feveral liquors from his
laboratory, was furprifed to fee it fuddenly ftained with a
moft beautiful colour. Recollecting the liquors he had
thrown on each other, he made a fimilar mixture in a vef-
fel, and produced the fame colour. He did not publifll
his procefs, but prepared and fold his blue, which was
fubftituted for ultramarine. The account of it was
fir ft publifhed in the Berlin Memoirs, 1710; but with-
out a description of its procefs.
In a paper of Dr. Woodward's, communicated to the
Royal Society in 1724, there is given a fhort way of
making PruJJian blue, which was found to anfwer per-"-
feclly well; and occafioned feveral experiments, whereby
was difcovered the nature of the bodies ufed in that pre-
paration.
The method was this. Four ounces of bullock's
blood dried, and four ounces of fait of tartar, prepared
from four ounces of crude tartar, and as much nitre, were
calcined together; two hours after which, a black fpungy
fubftance remained in the crucible, weighing four
ounces ; a folution of which being made in boiling wa-
ter, and afterwards filtered, left a remainder which when
dried weighed nine drams, An ounce of Englifh vitriol
was