DOI Page / Citation link:
https://doi.org/10.11588/diglit.19575#0396
363 U L T
Another way to make Ultramarine. Granting the two
former ways to be fufEcient, we will however here give a third,
which we believe may as well be pleafmg to thofe who are not
fatisfiecl with the other, as to fuch per ions as have a curiofity for
thefe fotts of" work.
Break the lapis into grofs pieces, as fmall as nuts; fet thefe in
a crucible into a furnace, till they redden with heat, and caft
them into cold water; do thus fix or feven times, and reduce
them to impalpable powder in a porphyry mortar well covered,
left the powder, which is very fubtile, fhould difperfe in the air j
and then fearce it with a finefearce alfo covered.
After this, take rofin of pines, ordinary black pitch, mafHc,
frefh wax, and turpentine, of each three ounces; of incenfe and
linfeed oil, each one ounce ; melt all together in an earthen vef-
fel, flirring them very well, that they may mix ; this fluff, being
well incorporated, caff it into water, and keep it for ufe.
To each pound of lapis lazuli add ten ounces thereof, and fet
them to diffblve in a pot over a fmall fire, firfl melf.ng the ce-
ment, and then calling on the lapis lazuli by little and little, con-
tinually flirring the mafs with a flick, that they may mix infen-
fibiy together. Afterwards call the mafs into an earthen vefTel
of cold water, and, anointing your hands with linfeed oil, mould-
it up into a number of cakes, or rolls, which leave in cold water
for five days, fhifting the water every other day.
This done, put them into a large and very clean glazed earth-
en vefiel, pouring on them fome clean hot water; when that
cools, pour in more hot, and do thus till the paftils foften with
the heat of the water ; this done, put them into hot water, and
let them be until it receive a bluilh colour. Strain this water to
receive the grofTer pieces, and fo put it into another glazed earthen
vefTel very clean, adding more to the paftils, which flrain through
a fine fearce afterwards among the former j continue this until
all the colour be extracted.
Your water mufl be only warm, otherwife it will occafion a
blacknefs in the colour, which is to be taken great care of.
All the coloured waters beins in the vefTel, you mav cleanfe
them of any uncfuofity, by letting them reft for twenty-four
hours, in which time the colour will flick to the bottom ; then
you may pour off the water gently into another vefTel, and it will
carry off the greafe along with it; flrain it afterwards into the
vefTel where the colour is through a fine fearce, and all the greafe
will be left behind. Do thus thrice, flirring the colour very
well every time you return -the water to it, that the filth and
greafe may afcend from it, and it will always flay in ftraining on
the fearce behind the water.
This done, let thccolow precipitate entirely, and pour eft all
the
Another way to make Ultramarine. Granting the two
former ways to be fufEcient, we will however here give a third,
which we believe may as well be pleafmg to thofe who are not
fatisfiecl with the other, as to fuch per ions as have a curiofity for
thefe fotts of" work.
Break the lapis into grofs pieces, as fmall as nuts; fet thefe in
a crucible into a furnace, till they redden with heat, and caft
them into cold water; do thus fix or feven times, and reduce
them to impalpable powder in a porphyry mortar well covered,
left the powder, which is very fubtile, fhould difperfe in the air j
and then fearce it with a finefearce alfo covered.
After this, take rofin of pines, ordinary black pitch, mafHc,
frefh wax, and turpentine, of each three ounces; of incenfe and
linfeed oil, each one ounce ; melt all together in an earthen vef-
fel, flirring them very well, that they may mix ; this fluff, being
well incorporated, caff it into water, and keep it for ufe.
To each pound of lapis lazuli add ten ounces thereof, and fet
them to diffblve in a pot over a fmall fire, firfl melf.ng the ce-
ment, and then calling on the lapis lazuli by little and little, con-
tinually flirring the mafs with a flick, that they may mix infen-
fibiy together. Afterwards call the mafs into an earthen vefTel
of cold water, and, anointing your hands with linfeed oil, mould-
it up into a number of cakes, or rolls, which leave in cold water
for five days, fhifting the water every other day.
This done, put them into a large and very clean glazed earth-
en vefiel, pouring on them fome clean hot water; when that
cools, pour in more hot, and do thus till the paftils foften with
the heat of the water ; this done, put them into hot water, and
let them be until it receive a bluilh colour. Strain this water to
receive the grofTer pieces, and fo put it into another glazed earthen
vefTel very clean, adding more to the paftils, which flrain through
a fine fearce afterwards among the former j continue this until
all the colour be extracted.
Your water mufl be only warm, otherwife it will occafion a
blacknefs in the colour, which is to be taken great care of.
All the coloured waters beins in the vefTel, you mav cleanfe
them of any uncfuofity, by letting them reft for twenty-four
hours, in which time the colour will flick to the bottom ; then
you may pour off the water gently into another vefTel, and it will
carry off the greafe along with it; flrain it afterwards into the
vefTel where the colour is through a fine fearce, and all the greafe
will be left behind. Do thus thrice, flirring the colour very
well every time you return -the water to it, that the filth and
greafe may afcend from it, and it will always flay in ftraining on
the fearce behind the water.
This done, let thccolow precipitate entirely, and pour eft all
the