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UNITED STATES PATENT OFFICE.
ARGYLE W. TUCKER AND ELIHU M. TUCKER, OF MANSFIELD, TEXAS.
PROCESS OF MAKING ELECTRIC GOLD PICTURES.
SPECIFICATION forming part of Letters Patent No. 372,720, dated November 8, 1887.
Application filed August 28, 1885. Renewed July 2, 1887. Serial No. 243,271. (No specimens.)To aZ1 whom, it may concern:
Be it known that we, ARGYLE W. TUCKER
and ELIHU M. TUCKER, of Mansfield, in the
county of Tarrant and State of Texas, have in-
5 vented a new and useful Improvement in the
Process of Making Electric Gold Pictures,
which improvement is fully set forth in the
following specification.
Heretofore the principal method for making
io porcelain pictures was first to clean the plate,
after which it was flowed with albumen or col-
lodion and left to dry, and then sensitized with
chloride of silver in the usual manner. The
plate is then treated in a dark room, and after-
15 ward exposed to sunlight with a negative in
close contact with it, and after printing it is
washed and toned the same as albumen-paper
photographs, and fixed with hyposulphate of
soda, washed, and dried, after which it is fit for
20 use.
The object of this invention is to provide a
photographing process whereby pictures may
be produced on any hard white surface-such
as marble, porcelain, glass, or analogous ma-
25 terial-by treating the plate or substance on
which the picture is made so as to make the
gold adhere firmly thereto, removing all oxide
of silver from the plate in such a manner that
the gold will be deposited in its stead and re-
30 instate the picture; the application of elec-
tricity in connection with the process, so as to
deposit the gold on the plate and make it ad-
here firmly thereto, and the process by which
light without a condenser may pass through
35 a negative for making an exposure on a sensi-
tized plate or any other substance in connec-
tion with the camera.
To carry our invention into effect we first
prepare the plate or substance by treating it
to with chloride of sodium (common salt) and
gum-arabic, in equal proportions, dissolved in
water. This preparation is left to stand about
twelve hours to dry, then washed thoroughly,
and again dried before using. After sensitizing
45 in the usual manner, the plate is then placed
in a camera and exposed to the action of the
light transmitted in the camera, after which
it is developed with the following solution,
namely: protosulphate of iron, four ounces,
50 twenty grains strong to the ounce; acetic acid,
one-half ounce; sulphate of copper, one-half
dram, after which it is thoroughly washed.
We then treat it with cyanide of potassium
until all the oxide of silver is removed or thepicture is nearly invisible, and then wash 55
thoroughly. We then hold a piece of zinc
plate in close contact with the back of the
plate, making the necessary connection with
the front surface to form an electric current
on the plate, after which it is treated to pure 6o
chloride-of gold solution until the picture re-
appears and reaches the desired shade or tone,
then again washed thoroughly and dried. If
a jet black is desired, the plate is subjected to
hot fumes of mercury. The plate in the gold 65
process may be electrified by a battery or any
other means. This sets the gold firmly on the
plate or substance, and may be polished until
the gold is clearly seen and is as indestructible
as the natural gold. 70
Having described our invention, what we
claim as new is-
1. The process of producing pictures on
porcelain or any hard white surface, which
consists in preparing the plate by treating it 75
with chloride of sodium and gum-arabic, then
drying, washing, and drying the same, then
sensitizing, then exposing the plate in a camera
to the light, and afterward developing it with
asolution of protosulphate of iron, acetic acid, 80
and sulphate of copper, then washing the plate
and treating it with cyanide of potassium,
then washing the plate again, then in forming
an electric current on the plate and afterward
treating it to pure chloride of gold, and finally 85
washing and drying the plate.
2. The process of making electric gold pic-
tures, which consists in treating the plate or
substance which has been duly exposed and
developed, as described, with cyanide of pota- 90o
sium to remove all the oxide of silver, so that
the metallic gold will be deposited and thus
reinstate the picture, and the application of
the current of electricity in the process, so as
to assist in depositing the gold on the plate, 95
and passing the light through the negative for
making an exposure on sensitive plates on the
camera, so as to dispense with the condenser,
all substantially as described.
In testimony that we claim the foregoing we ioa
have hereunto set our hands, this 28th day of
July, 1885, in the presence of witnesses.
ARGYLE W. TUCKER.
ELIHU M. TUCKER.
Witnesses:
P. W. LOWE,
F. G. WEITTENBERG.
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Tucker, Argyle W. & Tucker, Elihu M. Process of Making Electric Gold Pictures, patent, November 8, 1887; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth171661/m1/1/: accessed June 24, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.