IMPROVEMENTS IN PRINTING OR STAMPING INK
Year: 1882

page_text: LETTERS PATENT to Frank Wirth, of the firm of Wirth and Company,
Patent Solicitors, at Frankfort on the Main, in the Empire of Germany for an
Invention of IMPROVEMENTS IN PRINTING OR STAMPING INK A communi-
cation from the firm of Gebrueder Schmidt at Brockenbeim near Frankfort
on the Main in the Empire of Germany
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office of
the Commissioners of Patents on the 30th June 1882.
FRANK WIRTH of the firm of Wirth and Company, Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany. "IMPROVEMENTS IN PRINTING
OR STAMPING INK," a communication from the firm of Gebrueder Schmidt, at
Bockenheim, near Frankfort on the Main, in the Empire of Germany,
Ordinary printer's ink made of lamp-black and linseed-oil can only with the
greatest difficulty be removed from printed papers, in consequence of which waste
paper printed with this ink is not applicable for the manufacture of white paper.
To avoid this drawback I replace the lamp-black by the oxides of manganese,
which occur in nature, and one of which is produced by chemical works in great
quantities, the most advantageous method being to mix 70 parts of the peroxide
with 30 parts of linseed oil varnish, and grind the mixture well.
Instead of linseed oil varnish, its known substitutes (soft soap, turpentine,
glycerine or resinous soap) or an alkaline solution of casein, or mixtures of casein
with the said substances and ground magnesia may be used.
Special shades may be obtained in the usual manner by the addition of different
colouring matters.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Frank Wirth in the Great Seal Patent Office on the 29th
December 1882.
FRANK WIRTH of the firm of Wirth and Company Patent Solicitors
Frankfort-on-the-Main in the Empire of Germany "IMPROVEMENTS IN PRINTING
OR STAMPING INK A communication from the Firm of Gebrueder Schmidt of
Bockenheim near Frankfort-on-the-Main in the Empire of Germany
"
Ordinary printer's ink made of lamp black and linseed-oil can only with the
greatest difficulty be removed from printed papers, in consequence of which waste
paper printed with this ink is not applicable for the manufacture of white paper.
According to the present invention this difficulty is avoided by the employment
of the black or dark oxides of manganese in place of lamp black in the preparation
of printing or stamping ink; the inks thus prepared being capable of more or less
complete removal from the paper by means of certain reagents, at only small
expense, while at the same time they can be manufactured more cheaply than
ordinary inks.
For this purpose is employed principally the regenerated peroxide of manganese
which is produced in large quantities at chemical works, but other forms of the
oxides may be employed with advantage such as pyrolusite, manganite, and other
black or dark oxides of manganese.
The proportion of such oxides of manganese which has been found well adapted
for use is 25 parts by weight thereof with 75 parts linseed oil varnish, the two
being ground up well together; but I in no way limit myself to these proportions.
In place of linseed oil varnish may be used turnipseed oil, mineral oil, Olein, soft
soap, turpentine, glycerine, resin soap, paraffin, ozokerit, soap, and other similar
substances, either singly or in combination.
The known addition of other substances such as Nierosin and the like for
obtaining any particular shade or tint desired, may be employed in the same
manner as with ordinary inks, and in some cases a small percentage of lamp black
may be added in order to increase the yield, but such admixture should not exceed
from 6 to 7 per cent.
In order to remove inks prepared according to this Invention from the paper
again, the paper is first placed in an aqueous alkaline solution, and is then subjected
to the action of acids, more particularly hydrochloric acid.
Having thus described the nature of this Invention and in what manner the
same is to be performed as communicated to me by my correspondents, I claim :-
First. The manufacture of printing or stamping inks by the admixture of
peroxide or other black or dark oxide of manganese with linseed oil varnish or
other vehicle.
Second. The use of printing or stamping inks prepared from the per-oxide or
other black or dark oxide of manganese.
In Witness whereof I the said Frank Wirth have hereunto set my hand and
seal this eleventh day of December in the year of our Lord One thousand
eight hundred and eighty-two.