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Liquid Gold
Take an evaporating
dish, put into it 880 parts, by weight of pure gold; then 4,400 parts, by
weight, of muriatic
acid, and 3,520 parts, by weight, nitric acid; place
over a gas flame until the gold is dissolved, and then add to
it 22 parts,
by weight, of pure tin; when the tin is dissolved add 42 parts, by weight,
of butter of antimony. Let
all remain over the gas until the mixture begins
to thicken. Now put into a glass and test with the hydrometer, which
should
give about 1.800 specific gravity. Pour into a large glass and fill up with
water until the hydrometer shows
1090: pour all the solution into a chemical
pot and add to it 1,760 parts, by weight, balsam of sulphur, stirring well
all the while, and put it over the gas again; in an hour it should give, on
testing, 125° F.; gradually increase the heat
up to 185° F., when it should
be well stirred and then left to cool about 12 hours. Pour the watery fluid
into a large
vessel and wash the dark-looking mass 5 or 6 times with hot
water; save each lot of water as it contains some
portion of gold. Remove
all moisture from the dark mass by rolling on a slab and warming before the
fire occasionally
so as to keep it soft: When quite dry add 2 ½ times its
weight of turpentine and put it over a small flame for
about 2 hours; then
slightly increase the heat for another hour and a half. Allow this to stand
about 24 hours, and
then take a glazed bowl and spread over the bottom of
it1, 760 parts, by weight, of finely powdered bismuth; pour the
prepared
gold over it in several places. Now take a vessel containing water and place
inside the other vessel
containing the gold and heat it so as to cause the
water to boil for 3 hours; allow it to remain until settled and pour off
the
gold from the settlings of the bis, muth, and try it; if not quite right
continue the last process until good; the bismuth
causes the gold to adhere.
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