118 / 330
118 600
MISCELLANEOUS
VALUABLE
EECEIPTS.
useful
for
several
purposes.
They
are
most
valuable
when
so
manufactured
as
to
be
colourless.
They
are
much
used
in
preparing
varnishes,
and,
in
oil-
pamting,
are
not
unfrequently
employed
as
a
var-
nish,
either
alone
or
diluted
with
a
little
oil
of
tur-
pentine.
No.
228.
How
to
prepare
Linseed-
Oil
to
Boil
Varnishes,
Take
5
gallons
green
linseed-oil,
IJ
pounds
litharge,
and
IJ
pounds
amber.
Put
all
together
into
a
proper
vessel,
and
let
it
boil
1
J
or
2
hours
then
it
will
be
ready
for
use
when
cold.
You
must
also
strain
it.
No.
229.
Boio
to
boil
Linseed-
Oil
to
mix
with
Paint.
Take
2^
gallons
green
linseed-oil,
14
ounces
litharge,
and
4
ounces
amber.
Boil
all
together
until
it
is
clear
from
scum,
—
say
6
or
8
hours
;
be
careful
in
stirring
it
well.
If
you
want
to
have
the
oil
to
dry
very
quick,
add
double
the
quantity of
litharge
and
amber.
No.
230.
How
to
make
Copal
Varnish.
No.l.
The
foundation
of
all
varnishes
are
gummy
and
resinous
substances,
and
the
only
liquids
that
can
be
combined
with
them,
so
as
to
form
varnishes,
are
oils,
spirits
of
turpentine,
and
spirits
of
wine.
To
make
copal
varnish:
Take
22
ounces
gum
copal,
(good
and
clear,)
and
dissolve
it
in
a
proper