A NEW OR IMPROVED METHOD OF BLEACHING AMBER, COPAL, AND OTHER LACS, AND VARNISHES, AND LINSEED OIL; USEFUL ALSO IN THE MANUFACTURE OF VARNISH
Year: 1879

page_text: LETTERS PATENT to John Guy Wilson, of the Office for British & Foreign
Patents, 71, Market Street, in the City of Manchester, Mechanical Engineer
and Patent Agent, for the Invention of "A NEW OR IMPROVED METHOD OF
BLEACHING AMBER, COPAL, AND OTHER LACS, AND VARNISHES, AND LINSEED
OIL; USEFUL ALSO IN THE MANUFACTURE OF VARNISH." A communication
from abroad by Doctor Ernst Schrader and Otto Dumcke, both of Königsberg,
Prussia in the Empire of Germany.
PROVISIONAL SPECIFICATION left by the said John Guy Wilson at the
Office of the Commissioners of Patents on the 8th August 1879.
JOHN G. WILSON, of the Office for British & Foreign Patents, 71, Market St.,
"A NEW
in the City of Manchester, Mechanical Engineer and Patent Agent.
OR IMPROVED METHOD OF BLEACHING AMBER, COPAL, AND OTHER LACS AND
VARNISHES, AND LINSEED OIL; USEFUL ALSO IN THE MANUFACTURE OF VARNISH."
A communication from abroad by Doctor Ernst Schrader and Otto Dumcke,
both of Königsberg, Prussia, in the Empire of Germany.
This Invention relates to a new or improved method of bleaching lacs or varnishes
and linseed oil, and to the preparation of varnish from linseed oil. In carrying
out the Invention the linseed oil, the lacs, or varnishes composed of solutions of
colophony, amber, copal, and other resins in turpentine oil are exposed to the
influence of ozone, either in flat vessels, by conducting a current of ozoned
air over its surface, or by drawing or forcing ozoned air through the same when
confined in high and narrow vessels.
By thus exposing such oil or varnish to the action of atmospheric air and day
light they become effectually bleached, and in this manner totally dark colored
oils and varnishes are bleached in a few days.
In the manufacture of bleached varnish from linseed oil the process is as follows:-
The linseed oil is first mixed with a small per cent. of finished varnish and is then
exposed in suitable high and narrow vessels to a flow of ozoned air, which is forced
through the whole hight of the oil column by a suction or force pump, the oil
vessels being warmed during the operation by means of steam. In a short time

page_text: the original linseed oil is transferred into a rapidly drying varnish of a clear color.
The small amount of finished varnish mixed with it in the beginning serves to
attract the oxygen. Such is the affinity of the turpentine oil and the linseed oil
for oxygen in the above mentioned process that the same acts as a drying medium
and in a short time serves to transform the varnish into a solid body, and in this
manner, owing to its quickly drying properties, turpentine oil varnish may be used
in place of richer and more expensive varnish, seeing that the turpentine oil which
has served as a means of solution does not evaporate with the use of the varnish
but is transformed, as well as the linseed oil, prepared with ozone, into a solid body.
The ozone used in the before mentioned process can be produced in any suitable
way or ozoned oxygen may be substituted.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Guy Wilson in the Great Seal Patent Office on the 7th
February 1880.
JOHN GUY WILSON, of the Office for Patents, 71, Market Street, in the City of
Manchester, Mechanical Engineer and Patent Agent. "A NEW OR IMPROVED
METHOD OF BLEACHING AMBER, COPAL, OR OTHER LACS AND VARNISHES, AND
LINSEED OIL; USEFUL ALSO IN THE MANUFACTURE OF VARNISH." A communi-
cation from abroad by Doctor Ernst Schrader and Otto Dumcke, both of Königs-
berg, Prussia, in the Empire of Germany.
This Invention relates to a new or improved method of bleaching lacs or varnishes
and linseed oil, and to the preparation of varnish from linseed oil. In carrying out
the Invention the linseed oil, the lacs, or varnishes, composed of solutions of
colophony, amber, copal, and other resins in turpentine oil are exposed to the
influence of ozone, either in flat vessels by conducting a current of ozone or ozoned
air over its surface or by drawing or forcing ozone or ozoned air through the same
when confined in high and narrow vessels.
By thus exposing such oil or varnish to the action of atmospheric air and day
light they become effectually bleached, and in the manner totally dark colored oils
or varnishes are bleached in a few days.
In the manufacture of bleached varnish from linseed oil the process is as follows:-
The linseed oil is mixed with a small percentage of finished varnish and is then
exposed in suitable high and narrow vessels to a flow of ozoned air, which is forced
through the whole beight of the oil column by a suction or force pump, the oil
vessels being warmed during the operation by means of steam. In a short time
the original linseed oil is transformed into a rapidly drying varnish of a clear color ;
the small amount of finished varnish mixed with it in the beginning serves to
attract the bleaching properties of the oxygen.
Such is the affinity of the turpentine oil and the linseed oil for oxygen, in the
above mentioned processes, that the same acts as a drying medium and in a short
time serves to transform the varnish into a solid body, and in this manner, owing
to its quickly drying properties, turpentine oil varnish, prepared as aforesaid, may
be used in place of richer and more expensive varnish, seeing that the turpentine
oil which has served as a means of solution does not evaporate with the use of the
varnish but is transformed as well as the linseed oil prepared with ozone into a
solid body.
The ozone used in the before mentioned process can be produced in any ordinary
and known manner, or ozoned oxygen may be substituted.
Having thus particularly described and ascertained the nature of the said
Invention communicated to me as aforesaid, I wish it to be understood that I claim,―
1st. The method of treating and bleaching lacs, varnishes, and linseed oil,
substantially as herein before described.
2nd. The use of ozone as a dryer for turpentine and linseed oil, as hereinbefore
described.
3rd. The manufacture of bleached varnish from linseed oil, substantially as
hereinbefore described.
4th. In the manufacture of varnish from linseed oil, the use of a small percentage
of finished varnish, substantially as and for the purpose hereinbefore described.
In witness whereof, I, the said John Guy Wilson, have hereunto set my
hand and seal, this 6th day of February, in the year of our Lord One
thousand eight hundred and eighty.
JOHN G. WILSON. (L.S.)