DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.19574#0287
262
E N A
The firft intended for the counterfeiting and imitating preci-
ous ftones.
The fecond is for painting in Enamel.
The third is ufed by the enamellers, jewellers, and goldfmiths
on gold, filver, and other metals.
The Enamel ufed in imitating precious ftones, and alfo that
for painting, is ufually prepared by the workmen themfelves, who
are employed in thofe arts. The reft comes to us either from
Venice or Holland ; and particularly the white is that by which
the makers of the Dutch ware give the luftre and polifh to their
works.
The compofition is the fame in the main in all the three
kinds; the difference confifts only in giving it the colour and
tranfparency.
ENAMELS for painting. The white Enamel, ufed by pain-
ters in Enamel, is the fame with the common Enamel ufed by
enamellers ; except that it is to be prepared by grinding and
cleanfing it with aqua-fortis.
Then it is warned in fair water, pounded or ground over again
in a mortar made of flint or agate.
The black is made of perigueux well calcined, and ground
with oil of afpic 5 having an equal quantity of the enamellers or
goldfmiths black added to it.
The ruddy brown is made with faeces of vitriol and falt-petre,
or with the ruft of iron, well ground on an agate with oil of afpic.
The yellow Enamel is the lame with the goldfmiths Enamel,
the compofition of which you will fee hereafter.
Vermilion red is made with vitriol calcined between two cruci-
bles luted together; afterwards fir ft warned in aqua-fortis, and then
~V\ fair water ; the fire muft be moderate for about half an hour.
Lake red is compofed of fine gold diffolved in aquaregia, with
fal armoniac or common fait; when the difloiution has been
compleated, it is to be put into a cucurbit, with fpring water and
mercury in a fand-heat for twenty-four hours. Then the pow-
der which remains at the bottom of the cucurbit, after the wa-
ter has been poured off, is to be ground up with double its weight
of flower of fuiphur, put into a crucible and fet over a gentle fire.
And, after the fulphur which takes fire is exhaled, the red powder
which remains is to be ground up with rocaille.
Blue is made of the azure or lapis, ufed by oil-painters, well
purified and prepared with brandy, and fet for five or fix days in
a bottle expofed to the fun's rays.
An amber colour is made by white copperas calcined. Thefe
feven or eight colours or Enamels ferve for compounding all the
reft ; as blue and yellow make green, and fo of other colours.
'Jcwdkr7, goldfmiths, and, enamellers Enamels. Thefe are
brought
E N A
The firft intended for the counterfeiting and imitating preci-
ous ftones.
The fecond is for painting in Enamel.
The third is ufed by the enamellers, jewellers, and goldfmiths
on gold, filver, and other metals.
The Enamel ufed in imitating precious ftones, and alfo that
for painting, is ufually prepared by the workmen themfelves, who
are employed in thofe arts. The reft comes to us either from
Venice or Holland ; and particularly the white is that by which
the makers of the Dutch ware give the luftre and polifh to their
works.
The compofition is the fame in the main in all the three
kinds; the difference confifts only in giving it the colour and
tranfparency.
ENAMELS for painting. The white Enamel, ufed by pain-
ters in Enamel, is the fame with the common Enamel ufed by
enamellers ; except that it is to be prepared by grinding and
cleanfing it with aqua-fortis.
Then it is warned in fair water, pounded or ground over again
in a mortar made of flint or agate.
The black is made of perigueux well calcined, and ground
with oil of afpic 5 having an equal quantity of the enamellers or
goldfmiths black added to it.
The ruddy brown is made with faeces of vitriol and falt-petre,
or with the ruft of iron, well ground on an agate with oil of afpic.
The yellow Enamel is the lame with the goldfmiths Enamel,
the compofition of which you will fee hereafter.
Vermilion red is made with vitriol calcined between two cruci-
bles luted together; afterwards fir ft warned in aqua-fortis, and then
~V\ fair water ; the fire muft be moderate for about half an hour.
Lake red is compofed of fine gold diffolved in aquaregia, with
fal armoniac or common fait; when the difloiution has been
compleated, it is to be put into a cucurbit, with fpring water and
mercury in a fand-heat for twenty-four hours. Then the pow-
der which remains at the bottom of the cucurbit, after the wa-
ter has been poured off, is to be ground up with double its weight
of flower of fuiphur, put into a crucible and fet over a gentle fire.
And, after the fulphur which takes fire is exhaled, the red powder
which remains is to be ground up with rocaille.
Blue is made of the azure or lapis, ufed by oil-painters, well
purified and prepared with brandy, and fet for five or fix days in
a bottle expofed to the fun's rays.
An amber colour is made by white copperas calcined. Thefe
feven or eight colours or Enamels ferve for compounding all the
reft ; as blue and yellow make green, and fo of other colours.
'Jcwdkr7, goldfmiths, and, enamellers Enamels. Thefe are
brought