Articles of Gold or other Metal or Alloy.
Year: 1886

page_text: Date of Application, 16th Mar., 1886.
Complete. Left, 15th Dec., 1886.
Complete Accepted, 18th Jan., 1887.
on Articles of Gold or other Metal or Alloy.
I, CHARLES CLARKE, of 35, Crompton Road, Handsworth, Staffordshire, Jeweller,
do hereby declare the nature of this invention to be as follows
:-
My Invention consists in the new or improved process hereinafter described by
means of which I am enabled to produce a surface, exactly the same as what is known
in the Jewellery trade as a "coloured gold" surface, on goid articles of any degree of
fineness or on articles of any other metal or alloy, which surface has heretofore been
restricted to gold articles of twelve carat fine and upwards.
According to my Invention after cleaning or frosting or sand blasting the article of
gold, other metal or alloy, I deposit thereon, either by means of the electric current or
by simple immersion or by the process known as mercurial gilding, a thick layer of
gold alloyed with silver or copper or with both or with other metal or metals with
which gold can be alloyed. I then, by means of any one or more of the processes
known in the Jewellery trade as "colouring," extract the baser metal or metals from
the surface of the coat thus deposited on the article and so leave a surface of fine
gold "which will possess a uniformity of colour and permanence equal to ordinary"
coloured gold.
CHARLES BOSWORTH KETLEY,
128, Colmore Row, Birmingham,
Agent for the Applicant.

page_text: A New or Improved Process of Producing a "Coloured Gold" Surface
on Articles of Gold or other Metal or Alloy.
I, CHARLES CLARKE, of 35, Crompton Road, Handsworth, Staffordshire, Jeweller,
do hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
:-.
My Invention consists in the new or improved process hereinafter described by
means of which I am enabled to produce a surface, exactly the same as what is known
in the Jewellery trade as a "coloured gold" surface, on gold articles of any degree
of fineness or on articles of any other métal or alloy, which surface has heretofore
been restricted to gold articles of about twelve carat fine and upwards.
According to my Invention after cleaning or frosting or sand blasting the article of
gold, other metal or alloy, I deposit thereon by means of the electric current a thick
layer of gold alloyed with silver or copper or with both or with other metal or metals
with which gold can be alloyed. The said deposited layer of gold alloy may be of any
degree of fineness from about 12 carat-upwards but it must not be less or it will be
all removed by the "colouring" process. I then, by means of any one or more of
the processes known in the Jewellery trade as "colouring" (such for instance as by
immersing the article in a boiling mixture of Hydrochloric Acid, Potassium Nitrate,
Alum, Salt and Water, in quantities and proportions which depend upon the nature
of the alloy to be acted upon) extract the baser metal or metals from the surface of the
coat thus deposited on the article and so leave a surface of "fine gold" which will
possess a uniformity of colour and a permanence equal to ordinary coloured gold.
Having now particularly described and ascertained the nature of my said Invention,
and in what manner the same is to be performed, I declare that what I claim is
The new or improved process hereinbefore described of producing EL coloured gold
surface on articles of gold, or other metal or alloy, which consists in depositing on the
article a thick layer of gold alloy of about 12 carat fine and upwards and then by any
"colouring process" extracting the baser metal or metals from the deposited surface
so as to leave a surface of "fine gold " as herein set forth.
CHARLES BUSWORTH KETLEY,
Agent for the Applicant.