DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.19574#0076
6z
BLU
fore; repeat it again the fecond and third time, and your wafhes
fevenor eight times, in like manner.
Then let it ftand to dry for a week, and polifli it as before
directed ; and, laftly, to give it a polifhed and gloffed appear-
ance, clear it up with lamp-black and oil.
You may make the colour either light or deep, according to
your fancy ; if it have but a fmall proportion of the lead, it will
be deep ; but, if it has a larger, it will be lighter.
Alfo the fize for laying Blues, white, or any other colour*
ought not to be too ftrong, rather weaker, and juff. fufficient
to bind the colours, to make them flick on the work ; for, if it
be too ft iff, it will be apt to crack and fly off; and the reafon
of warning twice, with clear fize, is to keep the varnifh from
finking into, or tarnifhing the colours.
A Blul for ■painting or flaming glafs. Take of fine white
fand, twelve ounces ; zafter and minium, of each three ounces;
reduce them to a fine powder in a bell-metal mortar; then put
this powder into a very ftrong crucible, cover it and lute it well,
and, being dry, calcine over a quick fire for an hour; then take
out the matter, and pound it well in the mortar, as before; then*
to fixteen ounces of this powder, add fourteen ounces of nitre
powdered, mix them well together, and put them into the cru-
cible again, cover and lute it, and calcine for two hours in a very
ftrong fire.
Take it out and grind it as before, then add to it a fixth part
of nitre, and calcine again, as before, for three hours morej
then take out the matter with an iron fpatula red-hot, left it
fhould flick; it being very clammy, and not eafily emptied.
To dye barky-fir aw of a Blue colour. Take a fufficient quan-
tity of lixivium, or pot-afhes, and a pound of litmus, or lac-
tnus, ground ; make a decodtion ; then put in your ftraw, and
oil it, and it will be Blue.
To dye woody horns, or bones. Blue. Firft boil them in alum
water, then put them into a diffolution of indigo in urine.
To dye brifllcs and feathers Blue. Firft boil them in alum
water, and after, while they are warm, put them into a tinc-
ture of the juice of elder-berries. ♦
To make German Blue. Take fal armoniac, two pounds;
flowers of fulphur, three quarters of a pound ; quickfilver, half
a pound ; pound and grind them in an iron or marble mortar,
till the mercury is wholly mortified and difappears ; then put it
into a glafs body, well luted up to the middle ; fet it in a very
gentle fand-heat, uncovered, till all the moifture is vanifhed.
Stop it clofe, and increafe the heat gradually, to make the mafs
fublime; fo will you have an excellent azure or Blue, which
grind on a porphyry, to a fubtile powder, for ufe in painting;.
BLUEING,
BLU
fore; repeat it again the fecond and third time, and your wafhes
fevenor eight times, in like manner.
Then let it ftand to dry for a week, and polifli it as before
directed ; and, laftly, to give it a polifhed and gloffed appear-
ance, clear it up with lamp-black and oil.
You may make the colour either light or deep, according to
your fancy ; if it have but a fmall proportion of the lead, it will
be deep ; but, if it has a larger, it will be lighter.
Alfo the fize for laying Blues, white, or any other colour*
ought not to be too ftrong, rather weaker, and juff. fufficient
to bind the colours, to make them flick on the work ; for, if it
be too ft iff, it will be apt to crack and fly off; and the reafon
of warning twice, with clear fize, is to keep the varnifh from
finking into, or tarnifhing the colours.
A Blul for ■painting or flaming glafs. Take of fine white
fand, twelve ounces ; zafter and minium, of each three ounces;
reduce them to a fine powder in a bell-metal mortar; then put
this powder into a very ftrong crucible, cover it and lute it well,
and, being dry, calcine over a quick fire for an hour; then take
out the matter, and pound it well in the mortar, as before; then*
to fixteen ounces of this powder, add fourteen ounces of nitre
powdered, mix them well together, and put them into the cru-
cible again, cover and lute it, and calcine for two hours in a very
ftrong fire.
Take it out and grind it as before, then add to it a fixth part
of nitre, and calcine again, as before, for three hours morej
then take out the matter with an iron fpatula red-hot, left it
fhould flick; it being very clammy, and not eafily emptied.
To dye barky-fir aw of a Blue colour. Take a fufficient quan-
tity of lixivium, or pot-afhes, and a pound of litmus, or lac-
tnus, ground ; make a decodtion ; then put in your ftraw, and
oil it, and it will be Blue.
To dye woody horns, or bones. Blue. Firft boil them in alum
water, then put them into a diffolution of indigo in urine.
To dye brifllcs and feathers Blue. Firft boil them in alum
water, and after, while they are warm, put them into a tinc-
ture of the juice of elder-berries. ♦
To make German Blue. Take fal armoniac, two pounds;
flowers of fulphur, three quarters of a pound ; quickfilver, half
a pound ; pound and grind them in an iron or marble mortar,
till the mercury is wholly mortified and difappears ; then put it
into a glafs body, well luted up to the middle ; fet it in a very
gentle fand-heat, uncovered, till all the moifture is vanifhed.
Stop it clofe, and increafe the heat gradually, to make the mafs
fublime; fo will you have an excellent azure or Blue, which
grind on a porphyry, to a fubtile powder, for ufe in painting;.
BLUEING,