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1036
Enquire within upon everything
·
Robert Kemp Philp
235
419.
China
and
Glass.
The
best
material
for
cleansing
either
porcelain
or
glass,
is
fuller's
earth:
but
it
must
be
beaten
into
a
fine
powder,
and
carefully
cleared
from
all
rough
or
hard
particles,
which
might
endanger
the
polish
of
the
surface.
420.
Porcelain.
In
cleaning
porcelain,
it
must
also
be
observed
that
some
species
require
more
care
and
attention
than
others,
as
every
person
must
have
observed
that
chinaware
in
common
use
frequently
loses
some
of
its
colours.
421.
Red
Fading.
The
red,
especially
of
vermilion,
is
the
first
to
go,
because
that
colour,
together
with
some
others,
is
laid
on
by
the
Chinese
after
burning.
422.
Modern
Porcelain
Fades
Less.
The
modern
chinese
porcelain
is
not,
indeed,
so
susceptible
of
this
rubbing
or
wearing
off,
as--vegetable
reds
are
now
used
by
them
instead
of
the
mineral
colour.
423.
Temperature
with
China
and
Glass.
It
ought
to
be
taken
for
granted
that
all
china
or
glass
ware
is
well
tempered:
yet
a
little
careful
attention
may
not
be
misplaced,
even
on
that
point;
for
though
ornamental
china
or
glassware
is
not
exposed
to
the
action
of
hot
water
in
common
domestic
use,
yet
it
may
be
injudiciously
immersed
therein
for
the
purpose
of
cleaning;
and
as
articles
intended
solely
for
ornament
are
not
so
highly
annealed
as
others,
it
will
be
proper
never
to
apply
water
beyond
a
tepid
temperature.
424.
Annealing
Glass.
An
ingenious
and
simple
mode
of
annealing
glass
has
been
some
time
in
use
by
chemists.
It
consists
in
immersing
the
vessel
in
cold
water,
gradually
heated
to
the
boiling
point,
and
suffered
to
remain
till
cold,
when
it
will
be
fit
for
use.
Should
the
glass
be
exposed
to
a
higher
temperature
than
that
of
boiling
water,
it
will
be
necessary
to
immerse
it
in
oil.
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