AN IMPROVED MANUFACTURE OF RED COLOUR
Year: 1877

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine, Lake,
& Co., Patent Agents, Southampton Buildings, London, for the Invention of
"
AN IMPROVED MANUFACTURE OF RED COLOUR." A communication from
abroad by Johann Zeltner, of Nuremburg, Bavaria.
Sealed the 29th December 1877, and dated the 5th July 1877.
PROVISIONAL SPECIFICATION left by the said William Robert Lake at the
Office of the Commissioners of Patents on the 5th July 1877.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "AN IMPROVED MANUFACTURE OF RED COLOUR."
[A communication from abroad by Johann Zeltner, of Nuremburg; Bavaria.]
My Invention relates to the manufacture of a new colour to be called red ultra-
marine, which Invention is carried into practise in the following manner, that is
to say:-
I take violet ultramarine and heat the saine to a temperature of 130-150° Celsius,
and expose it to the action of vapours evolved from nitric acid more or less concen-
trated according to the precise shade of red desired to be produced. Strongly
concentrated nitric acid produces a colour approaching to a light pink, whereas
diluted nitric acid will produce a deeper and darker red colour.
For example, by varying the concentration of the nitric acid, I may produce a
pink colour, a colour between pink and red, and a deep red colour.
The production of these various shades of colour in the manner above described
will be found of great utility in all cases where pure and perinanent red colour is
desirable.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Robert Lake in the Great Seal Patent Office on the 5th
January 1878.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "AN IMPROVED MANUFACTURE OF RED COLOUR."
A communication from abroad by Johann Zeltner, of Nuremburg, Bavaria.
My Invention relates to the manufacture of a new color to be called "red ultra-
marine," which Invention is carried into practice in the following manner, that is
to say :-
I take violet ultramarine and heat the same to a temperature of 130-150° Celsius,
and expose it to the action of vapours evolved from nitric acid more or less concen-
trated according to the precise shade of red desired to be produced. Strongly
concentrated nitric acid produces a color approaching a light rose or pink, whereas
diluted nitric acid will produce a deeper and darker red colour.
For example, by varying the concentration of the nitric acid I may produce,-
1st. A pink or rose color.
2nd. A color or shade between pink and red.
And, 3rd. A deep red color.
The production of these various shades of colour in the manner above described
will be found of great utility in all cases where pure and permanent red color
is desirable.
Having thus fully described the said Invention as communicated to me by my
foreign correspondent, and the manner of performing the same,. I wish it understood
that I claim,
First. The above-described novel process for manufacturing red ultramarine.
Second. The new ultramarine color produced by this process.
In witness whereof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Fifth day of January, in the year of our Lord One
thousand eight hundred and seventy-eight.
WM ROBT LAKE (LS)