DOI Page / Citation link:
https://doi.org/10.11588/diglit.19574#0283
258 E M E
Emeralds ready cut or polifhed, and not cut, being of good
ftone and a fine colour, are worth :
L s.
Thofe weighing one carat or four grains - oo 10
Thofe of two carats —— —— i 7
Thofe of three carats - - 2 5
Thofe of four carats - - 3 10
Thofe of five carats - ■-■ 410
Thofe of fix carats - - 7 10
Thofe of feven carats - - 15 oo
Thofe of eight carats ■- - - 19 00
Thofe of nine carats - - 23 00
Thofe of ten carats - - - 33 00
Counterfeit Emerald. The manner of making counterfeit
Emerald in pafte is this: Take cryftal prepared, two ounces ;
common minium, or red lead, four ounces; mix thefe well to-
gether; then add, of good verdigreafe, two pennyweights, and
crocus martis, made with vinegar, eight grains. Mix all thefe
well together, and fet the whole in the hottest part of a potter's
furnace as long as the fire Iafts. It mull be put into a ftrong cru-
cible, and covered with a lute ; when it is cold, takeoff the lute,
and, if it is baked enough, it will be clear to the bottom ; other-
wife relute the pot, and put it into the furnace again. Twenty-
four hours, commonly, is fufficient for the making this ; fome-
times it requires a little more. The pafte thus made is harder
than ordinary, and is of a fine colour and capable of a good po-
lifh. Ncns Art of Glafs, p. 128.
If the pafte be defired of a very deep Emerald colour, take
prepared cryftal, one ounce ; red lead, fix ounces and an half;
of verdigreafe, three pennyweights and thirteen grains; and of
crocus martis, made with vinegar, ten grains ; this requires a
longer baking than the other, and is lefs hard, though of a deeper
colour. Neri, p. 129.
The proportions of thefe ingredients may be varied at plea-
fure, and the colour be made of all degrees of deepnefs; but, the
more lead is added, the more baking is required, and, after all,
the pafte will be fo much the fofter.
Emerald Colour, in the glafs trade. The way of giving this
beautiful dye to glafs is this: In the pots of melted metal, made
of pulverine, and without manganefe, when the matter is well
purified, put a little crocus martis calcined with vinegar ; about
three ounces of this crocus is enough for a 100 weight of glafs.
Let it ftand till thoroughly mixed, then put, into every 100 weight
of metal, two pounds of calcined brafs ; this muft be added at
different times, letting the metal ftand two hours every time.
When
Emeralds ready cut or polifhed, and not cut, being of good
ftone and a fine colour, are worth :
L s.
Thofe weighing one carat or four grains - oo 10
Thofe of two carats —— —— i 7
Thofe of three carats - - 2 5
Thofe of four carats - - 3 10
Thofe of five carats - ■-■ 410
Thofe of fix carats - - 7 10
Thofe of feven carats - - 15 oo
Thofe of eight carats ■- - - 19 00
Thofe of nine carats - - 23 00
Thofe of ten carats - - - 33 00
Counterfeit Emerald. The manner of making counterfeit
Emerald in pafte is this: Take cryftal prepared, two ounces ;
common minium, or red lead, four ounces; mix thefe well to-
gether; then add, of good verdigreafe, two pennyweights, and
crocus martis, made with vinegar, eight grains. Mix all thefe
well together, and fet the whole in the hottest part of a potter's
furnace as long as the fire Iafts. It mull be put into a ftrong cru-
cible, and covered with a lute ; when it is cold, takeoff the lute,
and, if it is baked enough, it will be clear to the bottom ; other-
wife relute the pot, and put it into the furnace again. Twenty-
four hours, commonly, is fufficient for the making this ; fome-
times it requires a little more. The pafte thus made is harder
than ordinary, and is of a fine colour and capable of a good po-
lifh. Ncns Art of Glafs, p. 128.
If the pafte be defired of a very deep Emerald colour, take
prepared cryftal, one ounce ; red lead, fix ounces and an half;
of verdigreafe, three pennyweights and thirteen grains; and of
crocus martis, made with vinegar, ten grains ; this requires a
longer baking than the other, and is lefs hard, though of a deeper
colour. Neri, p. 129.
The proportions of thefe ingredients may be varied at plea-
fure, and the colour be made of all degrees of deepnefs; but, the
more lead is added, the more baking is required, and, after all,
the pafte will be fo much the fofter.
Emerald Colour, in the glafs trade. The way of giving this
beautiful dye to glafs is this: In the pots of melted metal, made
of pulverine, and without manganefe, when the matter is well
purified, put a little crocus martis calcined with vinegar ; about
three ounces of this crocus is enough for a 100 weight of glafs.
Let it ftand till thoroughly mixed, then put, into every 100 weight
of metal, two pounds of calcined brafs ; this muft be added at
different times, letting the metal ftand two hours every time.
When