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extend its sensiti veness to diverse radiations when in combination with colours which have a strong absorbing power for such radiations, it is, however, an undoubted fact that of the thousands of organic synthetic colours which have the above-mentioned property, very few show any appreciable effect.
The research work concerning cyanide derivates, commenced by Miethe and Traube in 1900 and continued afterwards by Koenig, led to the discovery of those organic compounds, based on most complicated formulae which were called ethyl red, orthochrome, pinachrome, pinacyanol, dicyanine, etc., by which although it has not been possible to reach such high level of chromatic sensitiveness, especially in the case of green, as the three-colour process requires, notable results have been obtained. We cannot enter here into the chemical constitution of these colours or into their spectrographic and practical action. The subject has been dealt with in detail in a manual on Chemical Photography published by the author of this paper.
Until recently the maximum chromatic sensitiveness was produced only by emulsions having but a very moderate general sensitiveness. At the present date, however, owing to the great progress made in the chemistry of sensitive emulsions, which have made it possible to attain very rapid results without an eccessive increase of the grain and to produce panchromatic emulsions having a sensitiveness of 700-800 H and D, there is no doubt whatsoever that colour cinematography will not be handicapped as a result of insufficient sensitiveness of the film.
Independently of its application to colour cinematography, the Kodak, Agfa, etc., panchromatic film, possessing a high general and chromatic sensitiveness, has found an important application in the ordinary cinematography in studios, illuminated with incandescent lamps.
It is also worth while mentioning here the hypersensitive process discovered by Monpillard and applied by Ninck to autocromatic and panchromatic plates, although this process cannot easily be applied to cinematography. This process consists in the use of an ammoniacal solution of silver salt, preferably silver chloride,
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