DOI Page / Citation link:
https://doi.org/10.11588/diglit.19574#0108
94 C H A
Then they will remain at the bottom of the ve/Tel of a yel-
lowifh-red colour, which keep in a glafs well flopped for ting-
ing glafs or cryftal, which is yet better.
The third and lajl way of making Chalcedony. This, tho*
ibmcthing more tedious, furpafles the two other in beauty.
1. To make this preparation : Take the aqua-fortis, of
which put one pound into a glafs matrafs, with four ounces of
leaf filver to diflblve ; then Hop the matrafs.
2. Put a pound of the fame aqua-fortis, with five ounces of
mercury purified with fait and vinegar, after the following
manner:
Put common fait into a wooden difh, fprinkle it with vinegar,
and add to it a little common fair water to make it diflblve;
put in the mercury, and ftir it well with a wooden peftle to
draw out the blacknefs; repeat the warning them often with
fait and vinegar, till there be no more blacknefs ; then dry them
with warm linen or cotton, and pafs it through a glove ; then
it will be purified and fit to put into the aqua-fortis. When it
is diflolved, flop the matrafs and keep it.
3. Take another glafs body, put into it another pound of
aqua-fcrtis, with three ounces of fine filver calcined.
Amalgamate the filver with the mercury, as the goldfmiths
ufually do, and put it into a crucible, with its weight of com-
mon fait purified.
Then fet the crucible on hot coals, that the mercury may
evaporate, and that only the filver may remain at the bottom,
which will be purified and calcined.
Then add to that calcined filver an equal weight of common
fait, purified as before ; mix them well together, and fet them
over the fire in a crucible to calcine them again; then wafh
them well with warm water to take out the fait, and afterwards
put this filver into a glafs phial filled with common water ; boil it,
till one fourth of it is confumed, then let it cool and fettle to the
bottom ; after that decant off the water, and put more upon it.
Repeat this procefs with frefh water three times, and, at the!
fourth, dry the filver, put it into the aqua fords, and ftir it
well and ftop the matrafs.
The method of purifying common fait is as follows : Dif-
folve fea-fak in a convenient quantity of common water, boiling
it for the fpace of two hours; then let the water reft, that the
earthy part of the fait may fettle to the bottom ; then filtre the
water and evaporate it in an earthen veffel, or rather in a glafs
cucurbit, till the fait remain dry at the bottom.
Diflblve this fait again, making the water boil; then let it
{land for the dregs to fettle, after which filtre it and evaporate
it as before ; which you muft continue to do, till there are no
Z more
Then they will remain at the bottom of the ve/Tel of a yel-
lowifh-red colour, which keep in a glafs well flopped for ting-
ing glafs or cryftal, which is yet better.
The third and lajl way of making Chalcedony. This, tho*
ibmcthing more tedious, furpafles the two other in beauty.
1. To make this preparation : Take the aqua-fortis, of
which put one pound into a glafs matrafs, with four ounces of
leaf filver to diflblve ; then Hop the matrafs.
2. Put a pound of the fame aqua-fortis, with five ounces of
mercury purified with fait and vinegar, after the following
manner:
Put common fait into a wooden difh, fprinkle it with vinegar,
and add to it a little common fair water to make it diflblve;
put in the mercury, and ftir it well with a wooden peftle to
draw out the blacknefs; repeat the warning them often with
fait and vinegar, till there be no more blacknefs ; then dry them
with warm linen or cotton, and pafs it through a glove ; then
it will be purified and fit to put into the aqua-fortis. When it
is diflolved, flop the matrafs and keep it.
3. Take another glafs body, put into it another pound of
aqua-fcrtis, with three ounces of fine filver calcined.
Amalgamate the filver with the mercury, as the goldfmiths
ufually do, and put it into a crucible, with its weight of com-
mon fait purified.
Then fet the crucible on hot coals, that the mercury may
evaporate, and that only the filver may remain at the bottom,
which will be purified and calcined.
Then add to that calcined filver an equal weight of common
fait, purified as before ; mix them well together, and fet them
over the fire in a crucible to calcine them again; then wafh
them well with warm water to take out the fait, and afterwards
put this filver into a glafs phial filled with common water ; boil it,
till one fourth of it is confumed, then let it cool and fettle to the
bottom ; after that decant off the water, and put more upon it.
Repeat this procefs with frefh water three times, and, at the!
fourth, dry the filver, put it into the aqua fords, and ftir it
well and ftop the matrafs.
The method of purifying common fait is as follows : Dif-
folve fea-fak in a convenient quantity of common water, boiling
it for the fpace of two hours; then let the water reft, that the
earthy part of the fait may fettle to the bottom ; then filtre the
water and evaporate it in an earthen veffel, or rather in a glafs
cucurbit, till the fait remain dry at the bottom.
Diflblve this fait again, making the water boil; then let it
{land for the dregs to fettle, after which filtre it and evaporate
it as before ; which you muft continue to do, till there are no
Z more