AN ANALYTICAL PALETTE OF OILS
Year: 1878

page_text: LETTERS PATENT to Henri Rouaix; of Paris; in the Department of the
Seine, and Republic of France, Merchant, for the Invention of "AN
ANALYTICAL PALETTE OF OILS."
Sealed the 11th October 1878, and dated the 20th April 1878.
PROVISIONAL SPECIFICATION left. by the said, Henri Rouaix at the Office
of tlie Commissioners of Patents on the 20th April 1878.
HENRI ROUAIX, of Paris, in the Department of the Seine, and Republic of
France, Mercbant. "AN ANALYTICAL PALETTE OF Oils."
The object of my Invention is to discern or detect the mixture and the falsification
of oils. For this purpose I have invented a porcelain pallet of, say, 0m 28.centimeters
long, by 15 wide and 14 thick. At each end of this pallet, as will be seen on
reference to the accompanying Sheet of Drawing, is a cavity to hold a drop bottle,
intended for the oils, and in the middle are eight round concave cups or basins in:
which the operation is performed, each cup being about 42 millimetres in diameter,
between 4 and 5, millimeters deep, with flat bottom and rounded sides.
+
A's matter of detail I show two phials, one..of which has a ground stopper.and
contains the re-agent required for the operation, the other containing pure olive:
I have characterised in my pallet the coloration of pure oils capable of being
mixed; to proceed with order,I.count 30 drops of pure olive oil into one of the
cups of the pallet; this oil naturally has its own particular color, very bright yellow;
into another cup I count 30 drops of sesame oil ("cézame"). which gives one a
deeper coloration and produces a striking contrast, the color being a deep brown red';
between these two colors is to be discerned the per-centage of mixture which may
be made therein, the coloration of which will be shown in an album accompanying
[Price 6d1

page_text: each pallet, the operation being the same for all kinds of oil. To operate I therefore
take by means of the drop bottle 30 drops of olive oil, from the drop bottle
appertaining to the re-agent in the phial with ground stopper 9 drops of acid, the
operation manifesting itself by the coloration of the oil, which shows me the degree
of purity or of falsification of the oil which I am analysing by the more or less deep
colour I obtain, and I find the mixture, if there be one, upon the album accompanying
the pallet by referring to the comparative color.
The processes hitherto used to detect the falsification of oils have never given a
satisfactory result; my Invention consists especially in the creation of my pallet, as
it is with the precision and the almost instantaneous practical means thus secured that
I obtain an irrefutable result.
The re-agent being composed of a pure acid, I have invented my pallet and the
use of the cups, because by my study of the question I have ascertained that the
proper proportion and concavity of the cups of my pallet gave me a coloration
which could only be obtained by imitating my cups.
I therefore propose to claim the shape and concavity of the cups, which alone by
means of the re-agent will give an absolutely certain result, hitherto unattainable.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henri Rouaix in the Great Seal Patent Office on the 19th
October 1878.
HENRI ROUAIX, of Paris, in the Department of the Seine, and Republic of
France, Merchant. "AN ANALYTICAL PALETTE OF OILS."
The object of my Invention is to discern or detect the mixture and the falsifica-
tion of oils. For this purpose I have invented a porcelain palette of, say, 0m, 28 centi-
metres long, by 15¹/ wide, and 1/2 thick. At each end of this palette is a cavity,
as will be seen on reference to the accompanying Sheet of Drawing, to hold a drop
bottle intended for the oils, and in the middle are eight round concave cups or
basins in which the operation is performed, each cup being about 42 millimetres
in diameter, between 4 and 5 millimetres deep, with flat bottom and rounded
sides.
As matter of detail I show two phials, one of which has a ground stopper and
contains the re-agent required for the operation, the other containing pure olive oil.
OPERATION,
I have characterised in my palette the coloration of pure oils capable of being
mixed; to proceed with order,I count 30 drops of pure olive oil into one of the
cups of the palette; this oil naturally has its own particular color, very bright
yellow; into another cup I count 30 drops of oil of sesame (cézame), which gives
me a deeper coloration and produces a striking contrast, the color being a deep

page_text: brown red; between these two colours is to be discerned the per-centage of mixture
which may be made therein, the coloration of which will be shown in an album
accompanying each palette, the operation being the same for all kinds of oil. To
operate I therefore take by means of the drop bottle 30 drops of olive oil, from the
drop bottle appertaining to the re-agent in the phial with ground stopper 9 drops of
acid, the operation manifesting itself by the coloration of the oil, which shows me
the degree of purity or of falsification of the oil which I am analysing by the more
or less deep color I obtain, and I find the mixture, if there be one, upon the album
accompanying the palette by referring to the comparative color.
The processes hitherto used to detect the falsification of oils have never given a
satisfactory result; my Invention consists especially in the creation of my palette,
as it is with the precision and the almost instantaneous practical means thus secured
that I obtain an irrefutable result.
The re-agent being composed of a pure acid, I have invented my palette and the
use of the cups, because by my study of the question I have ascertained that the
proper proportion and concavity of the cups of my palette gave me a coloration
which could only be obtained by imitating my cups, which alone by means of the
re-agent will give an absolutely certain result, hitherto unattainable.
Having now described and ascertained the nature of my said Invention, and in
what manner the same is or may be performed, I claim as secured to me by the
herein-before in part recited Letters Patent, the use of a palette or apparatus for
analyzing oils combined, substantially as above set forth, and having cups of the
shape and concavity herein-before described, and illustrated on the accompanying
Sheet of Drawing.
In witness whereof, I, the said Henri Rouaix, have hereunto set my hand
and seal, this Seventh day of October, in the year of our Lord One thousand
eight hundred and seventy-eight.