DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.19574#0104
3o C H A
Cerufs is made of very thin laminae or plates oflead, fo laid
as to receive and imbibe the fumes of vinegar, placed in a vefTel
over a moderate fire.
The laminae or plates are, by means hereof, converted into a
white ruft, which is gathered together, and, being ground up
with water, is formed into little cakes.
Cerufs makes a beautiful white colour, and is much ufed by
painters both in oil and water colours.
The beft Cerufs is that of Venice, but this is rare; that which
is chiefly ufed, is either Englifh or Dutch, both of which have
more marl in them than white lead ; the latter however is the
better of the two.
CHALCEDONY, a precious ftone, of which there are
four fpecies; i. a bluifh-white one ; this is the mod common
of all, and is found in the fhape of our flints and pebbles, in
mafTes of two, three, or more inches diameter: It is of a whitifh
colour, with a faint cloud of blue diffufed all over it, but always
in the greateft degree near the furface ; this is little lefs hard
than the oriental onyx. The oriental Chalcedonies are the on-
ly ones of any value ; they are found in vaft abundance on the
fhores of rivers in all parts of the Eaft-Indies, and frequently
come over among the ballaft of the Eaft-India fhips: They are
common in Silelia and Bohemia, and other parts of Europe alfo,
but with us are lefs hard, more opaque, and of very little value.
2. The fecond fpecies is the dull milky-veined Chalcedony: This
is a ftone of little value, and is fometimes met with among our
lapidaries, who miftake it for a kind of nephritic ftone; it is of
a fomewhat yellowifh-white, or cream colour, with a few milk-
white veins: This is principally found in New Spain. 3. The
third fpecies is a brownifh-black dull and cloudy one, known to
the ancients by the name of the fmoaky jafper, or jafpis cap-
nitis: This is the leaft beautiful {tone of all this clafs ; it is of
a pale brownifh-white, clouded all over with a blackifh mift,
as the common Chalcedony is with a blue; it is common both
in the Eaft and Weft Indies, and in Germany, but is very little
valued, and feldom worked into any thing better than handles
of knives. 4. The fourth and laft fpecies is the yellow and red
Chalcedony : This is greatly fuperior to all the reft in beauty,
and is in great repute in Italy, though very little known with
us ; it is naturally compofed of an admixture of red and yellow,
only onaclouded cryftallinebafis,butis fometimes found blended
with the matter of the common Chalcedony : This is found on-
ly in the Eaft-Indies, and there not plentifully. The Italians
make it into beads, and both they and the Germans call thefe
caffidonies; but they are not determined in the ufe of the word,
but call beads of feveral agates by the fame name.
Cerufs is made of very thin laminae or plates oflead, fo laid
as to receive and imbibe the fumes of vinegar, placed in a vefTel
over a moderate fire.
The laminae or plates are, by means hereof, converted into a
white ruft, which is gathered together, and, being ground up
with water, is formed into little cakes.
Cerufs makes a beautiful white colour, and is much ufed by
painters both in oil and water colours.
The beft Cerufs is that of Venice, but this is rare; that which
is chiefly ufed, is either Englifh or Dutch, both of which have
more marl in them than white lead ; the latter however is the
better of the two.
CHALCEDONY, a precious ftone, of which there are
four fpecies; i. a bluifh-white one ; this is the mod common
of all, and is found in the fhape of our flints and pebbles, in
mafTes of two, three, or more inches diameter: It is of a whitifh
colour, with a faint cloud of blue diffufed all over it, but always
in the greateft degree near the furface ; this is little lefs hard
than the oriental onyx. The oriental Chalcedonies are the on-
ly ones of any value ; they are found in vaft abundance on the
fhores of rivers in all parts of the Eaft-Indies, and frequently
come over among the ballaft of the Eaft-India fhips: They are
common in Silelia and Bohemia, and other parts of Europe alfo,
but with us are lefs hard, more opaque, and of very little value.
2. The fecond fpecies is the dull milky-veined Chalcedony: This
is a ftone of little value, and is fometimes met with among our
lapidaries, who miftake it for a kind of nephritic ftone; it is of
a fomewhat yellowifh-white, or cream colour, with a few milk-
white veins: This is principally found in New Spain. 3. The
third fpecies is a brownifh-black dull and cloudy one, known to
the ancients by the name of the fmoaky jafper, or jafpis cap-
nitis: This is the leaft beautiful {tone of all this clafs ; it is of
a pale brownifh-white, clouded all over with a blackifh mift,
as the common Chalcedony is with a blue; it is common both
in the Eaft and Weft Indies, and in Germany, but is very little
valued, and feldom worked into any thing better than handles
of knives. 4. The fourth and laft fpecies is the yellow and red
Chalcedony : This is greatly fuperior to all the reft in beauty,
and is in great repute in Italy, though very little known with
us ; it is naturally compofed of an admixture of red and yellow,
only onaclouded cryftallinebafis,butis fometimes found blended
with the matter of the common Chalcedony : This is found on-
ly in the Eaft-Indies, and there not plentifully. The Italians
make it into beads, and both they and the Germans call thefe
caffidonies; but they are not determined in the ufe of the word,
but call beads of feveral agates by the fame name.