IMPROVEMENTS IN THE MANNER, METHOD OR MODE OF PREPARING AND PRODUCING COLOURED PHOTOGRAPHS, AND IN THE ARRANGEMENTS AND APPARATUS EMPLOYED THEREFOR:
Year: 1883

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PROVISIONAL SPECIFICATION left by Albert Kepler, Achille Morin de
Premion, and Alfred Pigeau at the Office of the Commissioners of Patents on
the 20th November 1883.
ALBERT KEPLER, of Peckham in the County of Surrey, ACHILLE MORIN DE
PREMION, and ALFRED PIGEAU of Lombard Street in the City of London,
IMPROVEMENTS IN THE MANNER, METHOD OR MODE OF PREPARING AND
PRODUCING COLOURED PHOTOGRAPHS, AND IN THE ARRANGEMENTS AND APPARATUS
EMPLOYED THEREFOR:"
This invention 'has for its object, improvements in the process and apparatus
employed for producing coloured photographs, by means of which ordinary positives
are rendered transparent, and consists in the employment of a certain solution or
compound hereinafter described by means of which and the aid of suitable apparatus,
and in the employment of a wash for removing the surplus solution, the positives
are made transparent and ready for being coloured at the back; after which, on
applying suitable artists oil colours on the back of the said positive a most accurate
and faithful representation of the objects in all their colours results but which up to
the present time by ordinary photography are only produced in black and white
by which means, the cost of producing durable and brilliant coloured photographs
is greatly reduced and simplified.
In carrying our Invention into practical use or effect we take one or more
ordinary photographic positive or positives and place the same in the Preparer
which may be a metallic box, chamber or receptacle so arranged as to admit of
being adjusted to and maintained at a uniform temperature without any great
variation or loss of the heat in which Preparer we have previously placed a suitable
quantity of the solution or compound hereinafter described; this solution or
compound is kept at a uniform temperature of 90° centigrade-say 195° Fahr:
which is maintained for three hours during which time it is allowed to act on the
positive or positives, and at the expiration of this time it is allowed to cool and
coagulate and remain in that state for twelve hours. At the end of this time, the-
Preparer is again heated in order to allow of the withdrawal of the said positive or
positives.
The solution, compound or bath hereinbefore spoken of is composed of equal parts
of clarified Resin and essence or spirits of Turpentine in about equal proportions

page_text: which are melted together and maintained at or in a liquid state or that due to a
temperature of 85° to 90° centigrade-say 194 Fahr: and this must be kept up
whilst the positive or positives are in the bath for about twelve hours.
On removing them from the Preparer they will be found to have a thick layer
or coating of the solution or compound adhering to them from which it is necessary
they should be freed. For this purpose we employ a dryer consisting of a metallic
trough or receptacle arranged with a jacket or casing into which steam, hot air,
hot water or other suitable and convenient means for heating, being adjusted to,
and maintaining the required temperature is or are allowed to pass so as to
maintain the-same temperature as that in the preparer namely 90° centigrade-say
195 Fahr:
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The positives are placed at the bottom of the dryer-which is or may be provided
with a false bottom and a ready and convenient means for removing the positives
and the heat causes the solution or compound to melt and run off from them to
the bottom of the dryer, and when the solution or compound is fully liquid and has
passed off the positives may be lifted out and suffered to drain for a few minutes
without cooling when the remaining solution or compound may be easily removed
from the positive by the aid of a wash consisting of benzine applied by the aid of a
sponge or wad or in any other convenient or suitable manner.
The positives are then laid on a perfectly clean surface for a period of a few
minutes till dry varying according to the dryness and temperature when they will
be found ready to be painted at the back with the desired artists oil colours each
of which is laid on uniformly over the surface it is intended to occupy without
any regard to light or shade on such part, and in consequence of the materials used
and the manner of employing the same, the paper on which the positive has been
printed permits the colours to penetrate into and amalgamate with it in such a
manner as to render them indelible whilst retaining the brilliancy and durability
of oil paintings and they may be then cemented or mounted on a suitable surface or
surfaces and subjected to a strong pressure to render the adhesion complete.
By preference we employ the best artists oil colours which may be either those
contained in tubes or we may take the dry colours and mix them as required.