IMPROVEMENTS IN THE MANUFACTURE OF A BLACK PRINTERS' INK, ALSO APPLICABLE AS ETCHING VARNISH, AND AS INK FOR STAMPING PURPOSES
Year: 1880

page_text: LETTERS PATENT to Carl Kesseler, of 63, Mohrenstrasse, Berlin, W., in the
Empire of Germany, Civil Engineer and Patent Solicitor, for an Invention of
"IMPROVEMENTS IN THE MANUFACTURE OF A BLACK PRINTERS' INK, ALSO
APPLICABLE AS ETCHING VARNISH, AND AS INK FOR STAMPING PURPOSES."
A communication from Hermann Gunther, of Berlin, in the Empire of
Germany.
PROVISIONAL SPECIFICATION left by the said Carl Kesseler at the Office
of the Commissioners of Patents on the 31st May 1880.
CARL KESSELER, of 63, Mohrenstrasse, Berlin, W., in the Empire of Germany,
Civil Engineer and Patent Solicitor. "IMPROVEMENTS IN THE MANUFACTURE OF
A BLACK PRINTERS' INK, ALSO APPLICABLE AS ETCHING VARNISH, AND AS INK
FOR STAMPING PURPOSES." A communication from Hermann Gunther, of Berlin,
in the Empire of Germany.
This Invention relates to certain improvements in the manufacture of a black
printers' ink, which ink is also applicable as etching varnish, and as ink for
stamping purposes.
The ingredients from which this black printers' ink and etching varnish are
made are (1) pitch or asphalte; (2) fatty acid violet of aniline (combinations of the
violet of aniline with one or several of the acids of the series of fatty acids);
(3) the fatty residue remaining from the distillation of heavy resinous oil (so called
carriage-grease); (4) heavy rectified tar oil (so called oil of anthracine, obtained as
bye-product in the preparation of anthracine.
This heavy tar oil, last mentioned, that is so called anthracine-oil, requires the
following preliminary preparation-It has to be boiled with an addition of at
least 10% of chloride of copper, whereby the smell is improved, the whole
thickened, and a blackish brown colour is imparted to it.
The produce so gained, by adding 1 or 2 parts to the thousand parts of fatty
acid, violet of aniline will serve as black stamping ink, and will be found specially
applicable for the cancelling of postage stamps, which by this ink become totally
unfit for repeated use because this dye penetrates deeply into the paper.

page_text: For the production of the black printers' ink and the etching varnish, the
substances enumerated under heads 1 and 4 above are intimately mixed up by
stirring them when hot, and when this compound has cooled down to no more
than 100° centigrade the substances enumerated under heads 2 and 3 above are
added whilst the stirring is continued.
The following proportions of mixture have been found best, although they may
be varied :-
40 parts by weight of black pitch or asphalte as obtained from coal tar.
60 parts by weight of tar-oil or oil of anthracine, coloured blackish brown, as
above described.
8 parts by weight of fat of resinous oil.
0.02 parts by weight of fatty acid violet of aniline.
Should the compound so produced be found to be of too great consistency for
printers' or stamping ink it may easily be thinned by adding some of the oil of
anthracine, blackened, as above specified; in the opposite case the necessary
quantity of pitch or asphalte will have to be added.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Carl Kesseler in the Great Seal Patent Office on the 30th
November 1880.
CARL KESSELER, of 63, Mohrenstrasse, Berlin W., in the Empire of Germany,
Civil Engineer and Patent Solicitor. "IMPROVEMENTS IN THE MANUFACTURE OF
A BLACK PRINTERS' INK, ALSO APPLICABLE AS ETCHING VARNISH, AND AS INK
FOR STAMPING PURPOSES." A communication from Hermann Günther, of Berlin,
in the Empire of Germany.
This Invention relates to certain improvements in the manufacture of a black
printers' ink, which ink is also applicable as etching varnish, and as ink for
stamping purposes.
The ingredients from which this black printers' ink and etching varnish are
made are:-
1. Pitch or asphalte.
2. Fatty acid violet of aniline (combination of the violet of aniline with one or
several of the acids of the series of fatty acids).
3. The fatty residue remaining from the distillation of heavy resinous oil (so
called "carriage grease").
4. Heavy rectified tar oil (so called "oil of anthracene,” obtained as bye-product
in the preparation of anthracene).
This heavy tar-oil last mentioned is the so called "anthracene-oil," and requires
the following preliminary preparation:-It has to be boiled with an addition of at
least 10% of chloride of copper, whereby the smell is improved, the whole
thickened, and a blackish brown colour is imparted to it.
The produce so gained, by adding 1 or 2 parts to the thousand parts of fatty
acid violet of aniline will serve as black stamping-ink, and will be found specially
applicable for the cancelling of postage stamps, which by this ink become totally
unfit for re-use, because this dye penetrates deeply into the paper.
For the production of the black printers' ink and the etching varnish the
substances enumerated under heads 1 and 4 above are intimately mixed together by
stirring them when hot, and when this compound has cooled down to no more
than 100° centigrade the substances enumerated under heads 2 and 3 above are
added whilst the stirring is continued.
The following proportions of mixture have been found best, although they may
be varied :-
40 parts by weight of black pitch or asphalte as obtained from coal-tar.
60 parts by weight of tar-oil or oil of anthracene, coloured blackish brown, as
above described.
8 parts by weight of fat of resinous oil.
002 parts by weight of fatty acid violet of aniline.
Should the compound so produced be found to be of too great consistency for
printers' or stamping ink it may easily be thinned by adding some of the oil of
anthracene, blackened as above specified; but in the opposite case the necessary
quantity of pitch or asphalte will have to be added.
Having now described the nature and particulars of the said Invention, I
claim,-
First. The preparing from pitch or asphalte, fatty-acid violet aniline, resinous-
oily-fat and heavy oil of tar (so called oil of anthracene), which will be coloured
black by boiling and adding at least 10% of chloride of copper, a printing ink, also
applicable as etching varnish, as herein set forth.

page_text: Second. The producing of a black stamping-ink by the boiling of heavy oil of
tar (so called oil of anthracene, the residue in the manufacture of anthracene) with
at least 10% of chloride of copper, and under addition of two parts to the thousand
of fatty acid violet of aniline, as set forth.
In witness whereof, I, the said Carl Kesseler, have hereunto set my hand and
seal, this Twenty sixth day of November, in the year of our Lord One
thousand eight hundred and eighty.
CARL KESSELER. (L.S.)