Lab
Library
Journal
Shop
Sign in
to keep
Share image
1
1036
Enquire within upon everything
·
Robert Kemp Philp
813
[NEVER
WALK
ONE
WAY
AND
LOOK
ANOTHER.]
2344.
Impressions
from
Coins.
Melt
a
little
isinglass
glue
with
brandy,
and
pour
it
thinly
over
the
medal,
&c.,
so
as
to
cover
its
whole
surface;
let
it
remain
on
for
a
day
or
two,
till
it
has
thoroughly
dried
and
hardened,
and
then
take
it
off,
when
it
will
be
fine,
clear,
and
hard,
and
will
present
a
very
elegant
impression
of
the
coin.
It
will
also
resist
the
effects
of
damp
air,
which
occasions
all
other
kinds
of
glue
to
soften
and
bend
if
not
prepared
in
this
way.
2345.
Method
of
Hardening
Objects
in
Plaster
of
Paris.
Take
two
parts
of
stearine,
two
parts
of
Venetian
soap,
one
part
of
pearlash,
and
twenty-four
to
thirty
parts
of
a
solution
of
caustic
potash.
The
stearine
and
soap
are
cut
into
slices,
mixed
with
the
cold
lye,
and
boiled
for
about
half
an
hour,
being
constantly
stirred.
Whenever
the
mass
rises,
a
little
cold
lye
is
added.
The
pearlash,
previously
moistened
with
a
little
rain
water,
is
then
added,
and
the
whole
boiled
for
a
few
minutes.
The
mass
is
then
stirred
until
cold,
when
it
is
mixed
with
so
much
cold
lye
that
it
becomes
perfectly
liquid,
and
runs
off
the
spoon
without
coagulating
and
contracting.
Previously
to
using
this
composition,
it
should
be
kept
for
several
days
well
covered.
It
may
be
preserved
for
years.
Before
applying
it
to
the
objects,
they
should
be
well
dusted,
the
stains
scraped
away,
and
then
coated,
by
means
of
a
thick
brush,
with
the
wash,
as
long
as
the
plaster
of
Paris
absorbs
it,
and
left
to
dry.
The
coating
is
then
dusted
with
leather,
or
a
soft
brush.
If
the
surface
has
not
become
shining,
the
operation
must
be
repeated.
Marker
Marker
Fine marker
White-out
Fine white-out
Circle
Paint
Unmarker
Hand
Scalpel
Dice
Sieve
Purify
Undo
Redo
Start over
