Improved Varnish for Protecting Bright Metals, and Solvent for Removing such Varnish when required.
Year: 1895

page_text: Date of Application, 31st Jan., 1895
Complete Specification Left, 24th Oct., 1895-Accepted, 30th Nov., 1895
PROVISIONAL SPECIFICATION.
Improved Varnish for Protecting Bright Metals, and Solvent for
Removing such Varnish when required.
1, HERBERT CROWTHER, of 23 Quarry Mount Terrace, Delph Lane, in the
City of Leeds, Clerk, do hereby declare the nature of this invention, to be as
follows:-
The object of this invention is to protect bright metallic surfaces from tarnishing
or oxidizing by coating them with my improved. varnish, and to provide a solvent
for removing such varnish or coating when it becomes dirty.
My improved varnish consists of gum damar soluble in cold alcohol, hot alcohol,
ether, benzol, benzoline, petroleum spirit or similar hydrocarbons.
The gum damar is dissolved in coal-tar benzol, or other suitable hydrocarbon,
to which I preferably add a sufficient quantity of petroleum spirit or benzoline, or
in lieu of this a larger proportion of coal-tar benzol.
The solvent, for removing such varnish and polishing the metal surface, consists
of a combination, in suitable proportions, of nitro-benzol and coal-tar benzol, or
other suitable coal-tar hydrocarbons, and is applied by means of a soft cloth.
Dated this 30th don of January 1805
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent to the Applicant.
Improved Varnish for Protecting Bright Metals, and Solvent for
Removing such Varnish when required.
I, HERBERT CROWTHER, of 23, Quarry Mount Terrace, Delph Lane, in the
City of Leeds, Clerk, 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:-
The object of this invention is to protect bright metallic surfaces from tarnishing
or oxidizing by coating them with my improved varnish, and to provide a solvent
for removing such varnish or coating when it becomes dirty.
My improved varnish consists of gum damar soluble in cold alcohol, hot alcohol,
ether, benzol, benzoline, petroleum spirit, or similar hydrocarbons.
The gum damar I employ is preferably that which is known as East Indian or
white damar, and for the purpose of producing my said varnish I take say two
pounds, or about, of such gum damar and dissolve it in, say two pounds or about,
of coal-tar benzol, or other suitable hydro-carbon.
To the solution thus obtained I add one gallon of petroleum spirit, paraffin
spirit or benzoline, or in lieu of this a larger proportion of coal-tar benzol, in order
to lower the specific gravity of the composition, so that the insoluble portion of
the gum will settle or be precipitated leaving a clear, colourless solution which
can be drawn off and forms my improved varnish, which is transparent.

page_text: In lieu of the "white gum damar" I may use any one of the four kinds of gum
damar namely damar proper or East Indian or white damar, sal damar, black
damar, and rock damar.
The solvent, for removing such varnish and polishing the metal surface consists
of a combination in suitable proportions, of nitro-benzol and coal-tar benzol, or
other suitable coal-tar hydro-carbons, and is applied by means of a soft cloth.
For producing my said solvent, to one gallon of nitro-benzol I add three gallons
of either coal-tar naptha or thirty per cent. benzol, or other suitable hydro-carbon.
These when thoroughly mixed form my solvent for removing the varnish as
specified above.
In using my invention the metal surface to be protected is first cleaned as
ordinary, the varnish is then applied to the surface by means of a brush, and
forms a coating which protects the bright metal surface from tarnishing or
oxidizing.
After the varnish has been so applied for three weeks, or about, it may have
become dirty, and it is desired to remove it and apply a fresh coating of varnish,
for the purpose of removing the varnish the solvent is applied by means of a soft
rag, and the old varnish readily removed, a new coating is then applied, as
desired.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
1. A varnish for protecting bright metals, produced by adding to a solution
made by dissolving gum damar in coal-tar benzol or other suitable hydro-carbon,
at quantity of benzoline, petroleum spirit, or other suitable hydro-carbon, in or
about the proportions stated, so as to cause the insoluble portions of the said gum
to precipitate, and leave a clear colourless and transparent varnish, substantially as
set forth.
2. A solvent, for removing the said varnish as above, produced by combining nitro-
benzol and coal-tar naptha, or other suitable hydro-carbon, in or about the
proportions, substantially as set forth.
Dated this 22nd day of Oct 1 1005
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent to the Applicant.
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent to the Applicant.