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Modern Magic: A Practical Treatise on the Art of Conjuring
·
Professor Hoffmann
743
Perhaps
this
is
the
reason
why
it
is
called
the
“black
art,”
and
was
the
cause
of
so
much
persecution
in
the
“good
old
days,”
when
all
was
so
pure
and
so
virtuous,
as
the
lovers
of
the
beaux
temps
would
have
us
believe.
But
pardon
this
digression.
In
the
other
bottle
place
a
weak
solution
of
the
proto-sulphate
of
iron,
about
a
half
ounce
to
about
a
pint
and
a
half
of
water.
Have
ready
a
bit
of
pyrogallic
acid--about
two-thirds
of
a
tea-spoonful,
wrapped
in
a
small
piece
of
blotting-paper
that
has
been
blacked
with
ink.
Having
completed
these
arrangements,
and
asserted
that
you
have
on
the
table
a
bottle
containing
water
and
another
ink,
you
borrow
a
handkerchief,
with
which
you
cover
the
bottle
containing
the
clear
solution,
and
in
doing
so
you
slip
into
it
the
pyrogallic
acid;
and
in
handing
the
bottle
to
one
of
the
audience
to
hold
you
give
the
contents
a
little
imperceptible
shaking.
You
then
take
another
handkerchief
and
place
it
over
the
other
bottle,
which
you
hand
to
a
person
to
hold.
You
then
command
the
contents
of
each
bottle
to
change
places.
Then,
in
removing
the
handkerchief
from
the
ink
bottle,
you
clutch
the
piece
of
string
and
quickly
pull
out
the
black
wool
and
throw
the
handkerchief
out
of
sight,
showing
the
bottle
to
contain
only
water.
You
then
ask
the
person
holding
the
other
bottle
to
remove
the
covering,
when
the
fluid
will
be
found
to
be
“as
black
as
night.”
This
trick
always
causes
the
greatest
astonishment.
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