An Improved Method of Preserving Painted Canvases.
Year: 1897

page_text: Date of Application, 25th Oct., 1897
Complete Specification Left 6th July 1898-Accepted 13th Aug. 1898
PROVISIONAL SPECIFICATION.
An Improved Method of Preserving Painted Canvases.
I, ADALBERT KREITMAYR, of Holzstrasse 5/1, Munich, in the Empire of Germany,
Glazier and Glass-painter, do hereby declare the nature of this invention to be
as follows:-
In order to avoid the influence of the atmosphere damp or the like, or attacks
of insects on the canvass usually employed as a ground for artistic paintings. I
proceed in the following manner :-
The back of the picture or of the canvass-surface is coated with an elastic varnish
having great adhesive properties. It is most convenient to use such varnish as
the oil-picture itself is varnished with. Then a moderately thick layer of tin foil
(pure tin) is laid on the varnished surface. This tin foil is pressed firmly thereon
so that it lies as closely as possible on the canvass-surface.
When several sheets
of tin-foil are necessary for covering the surface, the joints must cover well. When
the varnish has dried, the canvass possesses a covering layer entirely impenetrable
by the atmosphere etc.
Effects of change of temperature, dampness, insects etc., are prevented by the
tin-foil and varnish layer on the back of the canvass, as well as the known destruc-
tive salpeter containing sweat of walls. The two protecting layers are of great
advantage in shipping pictures, as they are impenetrable by the salty vapours of
the sea, which penetrate through the smallest pores of the packing and have an
extremely injurious effect on the canvass tissue. Also the restoration of such
pictures is much easier, as one finds always an under layer and need not overpaste
large holes or the like. The covering ground offers a complete substitute.
Oxydation of the tin is entirely excluded and the proceeding is so inexpensive,
that it can be generally used.
100
An Improved Method of Preserving Painted Canvases.
I, ADALBERT KREITMAYB, of Holzstrasse 5/1, Munich, in the Empire of Germany,
Glazier and Glass painter, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
In order to avoid the influence of the atmosphere, damp, or the like, or attacks
of insects on the canvass usually employed as a ground for artistic paintings. I
proceed in the following manner:-

page_text: The back of the picture or of the canvass surface is coated with an elastic varnish
having great adhesive properties. It is most convenient to use such varnish as
the oil picture itself is varnished with. Then a moderately thick layer of tin foil
(pure tin) is laid on the varnished surface. This tin foil is pressed firmly thereon
so that it lies as closely as possible on the canvass surface. When several sheets
of tin foil are necessary for covering the surface the joints must cover well. When
the varnish has dried, the canvass possesses a covering layer entirely impenetrable
by the atmosphere etc.
Effects of change of temperature, dampness, insects etc., are prevented by the
tin foil and varnish layer on the back of the canvass, as well as the known destruc-
tive saltpeter containing sweat of walls. The two protecting layers are of great
advantage in shipping pictures as they are impenetrable by the salty vapours of
the sea, which penetrate through the smallest pores of the packing and have an
extremely injurious effect on the canvass tissue. Also the restoration of such
pictures is much easier, as one finds always an under layer and need not overpaste
large holes or the like. The covering ground offers a complete substitute.
Oxydation of the tin is entirely excluded and the proceeding is so inexpensive
that it can be generally used.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare that what
I claim is:-
An improved process for securing the painting ground of oil pictures painted
on canvass against the influences of the atmosphere, etc., in which the back of the
canvass is coated with a strongly adhesive and elastic varnish and then covered
with tin foil.
Dated this on day or July 100.
HERBERT HADDAN & Co.,
Agents to Applicant, 18, Buckingham Street, Strand, W.C., London.
HERBERT HADDAN & Co.,
Agents to Applicant, 18, Buckingham Street, Strand, W.C., London.