按键盘上方向键 ← 或 → 可快速上下翻页，按键盘上的 Enter 键可回到本书目录页，按键盘上方向键 ↑ 可回到本页顶部！
————未阅读完？加入书签已便下次继续阅读！
waters； the two liquids are mixed together in a decanter and stirred for
20 minutes； and then filtered。 Finally 100 grams of whiting； dry and
sifted； are mixed with 5 grams of pulverised supertartrate of potass； this
new powder is dissolved in a portion of the above described liquid； in
sufficient quantity to form a paste of the proper consistency to be spread
with a pencil on the article or part to be gilded。 The superabundant
powder is then removed by washing and the article is beautifully gilded
with a heavy or light coat； according to the quantity of paste used。 Grams
belong to French weights； four grams are a little more than one drachm。
ELECTRO SILVERING … NEW METHOD
10 grams of nitrate of silver are dissolved in 50 grams of distilled
water； then 25 grams of cyanide of potassium in 50 grams of distilled
water； the two liquids are mixed in a decanter； and stirred for 10
minutes； it is then filtered。 Finally； 100 grams of sifted whiting are
mixed with 10 grams of pulverised supertartrate of potass and one gram of
mercury。 This powder and dissolving liquid are used in the same manner as
in the above method of gold plating。 These excellent methods of silvering
and gilding were discovered in June 1860； by the great French chemist
Baldooshong of Paris France。 It is far superior to any other method ever
discovered； and will eventually take the place of all。
8。 ELECTRO GOLD PLATING … USUAL METHOD
Take a 2 50c。 piece of gold； and put it into a mixture of 1 ounce of
nitric and 4 ounces of muriatic acids； （glass vessels only are to be used
in this work；） when it is all cut dissolve 1/2 an ounce of sulphate of
potash in one pint of pure rain water； and mix the gold solution； stirring
well； then let stand and the gold will be thrown down； then pour off the
acid fluid； and wash the gold in two or three waters； or until no acid is
tasted by touching the tongue to the gold。 Now dissolve one ounce of
cyanuret of potassium in one pint of pure rain water； to which add the
gold； and it is ready to use。 Clear the article to be plated from all dirt
and grease with whiting and a good brush； if there are cracks it may be
necessary to put the article in a solution of caustic potash。 At all
events every particle of dirt and grease must be removed； then suspend the
article in the cyanuret of gold solution； with a small strip of zinc cut
about the width of a common knitting needle； hooking the top over a stick
which will reach across the top of the vessel or bottle holding the
solution。 If the zinc is too large the deposit will be made so fast that
it will scale off。 The slower the plating goes on the better； and this is
arranged by the size if the zinc used。 When not using the plating fluid
keep it well corked and it is always ready to use； bearing in mind that it
is poison as arsenic； and must be put high out of the way of children； and
labelled poison； although you need have no fear using it； yet accidents
might arise it its nature were not known。
9。 ELECTRO SILVERING … USUAL METHOD
This is done every way the same as gold plating （using coin） except that
rock salt is used instead of the cyanuret of potassium to hold the silver
in solution for use； and when it is of the proper strength of salt it has
a thick curdy appearance； or you can add salt until the silver will
deposit on the article to be plated； which is all that is required。 No
hesitation need be felt in trying these receipts； as they are obtained
from a genuine source； and are in every day use。
10。 GOLD PLATING FLUID
Warm six ounces of pure rain water； and dissolve in it 2 ounces of cyanide
of potassium； then add a 1/4 ounce oxide of gold； the solution will at
first be yellowish； but will soon subside to white； then half fill a
bottle with whiting； fill it up with this solution and shake it well； you
may now take a piece of old cotton； wet it with the solution； rub it well
over brass； copper； &c。； and it is nicely washed with gold。
11。 SILVER PLATING FLUID
Dissolve one ounce of nitrate of silver； in crystal； in 12 ounces of soft
water； then dissolve in the water two ounces of cyanuret of potash； shake
the whole together and let it stand until it becomes clear。 Have ready
some 1/2 ounce vials； and fill them half full of whiting； then fill up the
bottles and it is ready for use。 The whiting does not increase the coating
powder … it only helps to clear the articles and save the silver fluid by
half filling the bottles。 The above quantity of materials will cost about
1。62c。； so that the fluid will be about 3 cents a bottle。 It is used in
the same way as the gold plating fluid。
12。 QUICKSILVER PLATING FLUID
Take of quicksilver one ounce； one ounce nitric acid； one ten cent piece；
rain water 1/2 pint to a pint； put the three first articles into a tumbler
together； let them stand until dissolved； occasionally stirring； then add
the water； and it is ready for use。 This is used in the same way as the
silver and gold plating fluid。
13。 TO GILD STEEL
Pour some of the ethereal solution of gold into a wine…glass； and dip into
it the blade of a new penknife； lancet； razor； &c。； withdraw the
instrument and allow the ether to evaporate； the blade will then be found
to be covered with a beautiful coat of gold； the blade may be moistened
with a clean rag or a small piece of very dry sponge dipped into the
ether； and the same effect will be produced。
14。 TO GILD COPPER； BRASS； &c。 … BY AN AMALGAM
The gilding of these inferior metals and alloys of them is effected by the
assistance of mercury with which the gold is amalgamated。 The mercury is
evaporated while the gold is fixed by the application of heat； the whole
is then burnished of left mat in the whole or in part； according as
required。
15。 GILDING GLASS AND PORCELAIN
Dissolve in boiling linseed oil an equal weight either of copal or amber；
and add as much oil of turpentine as will enable you to apply the compound
or size thus formed as thin as possible to the parts of the glass intended
to be gilt； the glass is to be placed in a stove till it is so warm as
almost to burn the fingers when handled。 At this temperature the size
becomes adhesive； and a piece of leaf gold applied in the usual way will
immediately stick。 Sweep off the superfluous portions of the leaf； and
when quite cold it may be burnished； taking care to interpose a piece of
india paper between the gold and the burnisher。 It sometimes happens when
the varnish is not very good that by repeated washing the gold wears off；
on this account the practice of burning it in is sometimes had recourse
to； for this purpose some gold powder is ground with borax； and in this
state applied to the clean surface of the glass by a camel hair pencil；
when quite dry the glass is put into a stove； heated to about the
temperature of an annealing oven； the gum burns off； and the borax； by
vitrifying； cements the gold with great firmness to the glass