DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.19571#0269
THE ARTIST'S ASSISTANT. 255
" Take of very pure tin, one pound, put it into a
<: crucible, and fet it on a fire to melt ; when it be-
£; gins to run into fufion, add to it an equal propor-
" tion of bifmuth, or tin glafs, andftir the mixture with,
" an iron rod, or the fmall end of a tobacco pipe,
" till the whole be entirely melted, and incorpo-
11 rated : take the crucible then from the fire, and
<: after the melted compofition is become a little
Ci cooler, but while it is vet in a fluid ftate, pour into
t; it a pound of quickfilver gradually, ftirring it iu
t; the mean time, that the mercury may be thoroughly
<: conjoined with the other ingredients: when the
£: whole is thus commixed, pour the mafs out of the
''• crucible upon a flone, where, as it cools, it will
<J take the form of an amalgama, or metaline pafle,
11 which will be eafily bruifed into a flaky powder,
44 and is then fit for ufe."
This powder may be either tempered, in the man-
ner of the fhell gold, with gum water; or rubbed
over a ground properly fized, according to any of the
methods above directed for gold powder, and it will
take a very good polifh from the dog's tooth, or bur-
nifhers, and holds its colour much better with a
flight coat of varnifh over it, than any true filver
powder, or leaf.
The fizes for filvering ought to be mixed, as in the
cafe of gold, with yellow, or bole armoniac; but
with fome white fubftance, whofe effeft may prevent
any fmall failures in the covering the ground with
the filver being feen, in the fame manner as the yel-
low fubflances do the gold. This may be done with
flake white, or white lead, when the fizes formed of
oil are ufed ; but whiting is the proper matter in the
burnifh fize for filvering, or wherever the glover's,
or
" Take of very pure tin, one pound, put it into a
<: crucible, and fet it on a fire to melt ; when it be-
£; gins to run into fufion, add to it an equal propor-
" tion of bifmuth, or tin glafs, andftir the mixture with,
" an iron rod, or the fmall end of a tobacco pipe,
" till the whole be entirely melted, and incorpo-
11 rated : take the crucible then from the fire, and
<: after the melted compofition is become a little
Ci cooler, but while it is vet in a fluid ftate, pour into
t; it a pound of quickfilver gradually, ftirring it iu
t; the mean time, that the mercury may be thoroughly
<: conjoined with the other ingredients: when the
£: whole is thus commixed, pour the mafs out of the
''• crucible upon a flone, where, as it cools, it will
<J take the form of an amalgama, or metaline pafle,
11 which will be eafily bruifed into a flaky powder,
44 and is then fit for ufe."
This powder may be either tempered, in the man-
ner of the fhell gold, with gum water; or rubbed
over a ground properly fized, according to any of the
methods above directed for gold powder, and it will
take a very good polifh from the dog's tooth, or bur-
nifhers, and holds its colour much better with a
flight coat of varnifh over it, than any true filver
powder, or leaf.
The fizes for filvering ought to be mixed, as in the
cafe of gold, with yellow, or bole armoniac; but
with fome white fubftance, whofe effeft may prevent
any fmall failures in the covering the ground with
the filver being feen, in the fame manner as the yel-
low fubflances do the gold. This may be done with
flake white, or white lead, when the fizes formed of
oil are ufed ; but whiting is the proper matter in the
burnifh fize for filvering, or wherever the glover's,
or