DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.19574#0411
373 GL A
pears of a dirtyifh green colour. There are but twenty-five
tables to the cafe.
German Glafs is of two kinds, white and green; the firft h
of a whitifh colour, but fubjecf. to thofe fmall curved ftreaks,
obferved in our Newcaftle Glafs, though free from the fpots
and blemifhes thereof. The green, befides its colour, is liable
to the fame ftreaks as the white, but both of them are ftraighter
and lefs warped than our Newcaftle Glafs.
Dutch Glafs is not much unlike our Newcaftle Glafs, either
in colour or price: It is frequently much warped like that; and
the tables are but fmall.
Newcaftle Glafs is what is mo ft ufed in England : It is of
an afh-colour, and fubjedf. to fpecks, ftreaks, and other blemifhes,
and befides is frequently warped. There are forty-five tables
to the cafe, each containing five fuperficial feet; but fome fay
thirty-five tables, and fix feet in each table.
To tinge Glass of a deep red. Opaque colours have a body,
but the tranfparent ones none ; for which reafon this deep red
muft be mixed with matters that give it one, as {hall be fhewn.
Take twenty pounds of cryftal frit, one pound of pieces of
white Glafs, and two pounds of calcined tin ; mix the whole
well together, and put it into a pot, and fet it in a furnace that
it may purify.
When it is melted, caft in an ounce of calcined fteel well
pounded, and an ounce of fcales of iron from the anvil well pul-
verifed and mixed together; keep ftirringthe Glafs well with
an iron ftirrer, while you are putting in the powder, to hinder
it from rifing too much.
You muft take care not to put in too much of the powder,
for that would make the Glafs black, whereas it ought to be
clear, fhining, and of an obfcure yellow colour.
Then take about fix drachms of calcined copper prepared, cafi
it upon the melted glafs, often mixing it two, three, or four times,
and the Glafs will be as red as blood.
If the colour be as you would have it, you muft work it off
prefently, for fear it mould turn black, and the colour be loft,
of which great care muft be taken.
But if, notwithftanding this, the colour comes to be loft, you
muft add more fcales of iron in powdery and it will return.
To make a peach colour in Glass. To make this colour,
which is a very agreeable one, take Glafs prepared and tinged
of a milk-white, and, when it is in good f ufion, put in fome man-
ga nefe of Piedmont prepared, and that by little and little, ftir-
ring the matter well at each time, till the colour becomes as fine
and perfect as you defire it; but you rnuft work the Glafs in
time,
pears of a dirtyifh green colour. There are but twenty-five
tables to the cafe.
German Glafs is of two kinds, white and green; the firft h
of a whitifh colour, but fubjecf. to thofe fmall curved ftreaks,
obferved in our Newcaftle Glafs, though free from the fpots
and blemifhes thereof. The green, befides its colour, is liable
to the fame ftreaks as the white, but both of them are ftraighter
and lefs warped than our Newcaftle Glafs.
Dutch Glafs is not much unlike our Newcaftle Glafs, either
in colour or price: It is frequently much warped like that; and
the tables are but fmall.
Newcaftle Glafs is what is mo ft ufed in England : It is of
an afh-colour, and fubjedf. to fpecks, ftreaks, and other blemifhes,
and befides is frequently warped. There are forty-five tables
to the cafe, each containing five fuperficial feet; but fome fay
thirty-five tables, and fix feet in each table.
To tinge Glass of a deep red. Opaque colours have a body,
but the tranfparent ones none ; for which reafon this deep red
muft be mixed with matters that give it one, as {hall be fhewn.
Take twenty pounds of cryftal frit, one pound of pieces of
white Glafs, and two pounds of calcined tin ; mix the whole
well together, and put it into a pot, and fet it in a furnace that
it may purify.
When it is melted, caft in an ounce of calcined fteel well
pounded, and an ounce of fcales of iron from the anvil well pul-
verifed and mixed together; keep ftirringthe Glafs well with
an iron ftirrer, while you are putting in the powder, to hinder
it from rifing too much.
You muft take care not to put in too much of the powder,
for that would make the Glafs black, whereas it ought to be
clear, fhining, and of an obfcure yellow colour.
Then take about fix drachms of calcined copper prepared, cafi
it upon the melted glafs, often mixing it two, three, or four times,
and the Glafs will be as red as blood.
If the colour be as you would have it, you muft work it off
prefently, for fear it mould turn black, and the colour be loft,
of which great care muft be taken.
But if, notwithftanding this, the colour comes to be loft, you
muft add more fcales of iron in powdery and it will return.
To make a peach colour in Glass. To make this colour,
which is a very agreeable one, take Glafs prepared and tinged
of a milk-white, and, when it is in good f ufion, put in fome man-
ga nefe of Piedmont prepared, and that by little and little, ftir-
ring the matter well at each time, till the colour becomes as fine
and perfect as you defire it; but you rnuft work the Glafs in
time,