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The New Agfacolor Process
By PROF., DR. J. EGGERT
It is well known to those interested in the various phases of photography that through the entire history of the Art there has been a constant endeavor to reproduce pictures in color. As long ago as 1850 when the firstknown method was evolved, attempts were made to produce a medium or system by which reproductions would be rendered in natural color.
The introduction and success of motion pictures gave added impetus to this search, and many ideas have been brought forth attempting the solution of this problem.
Most of these methods are well-known to the average photographer and need no description here.
At present the most successful are the so-called subtractive systems which require no additional equipment when viewing, but are still complex in structure and involve a critical and expensive technique to produce. It would seem, after reviewing these present methods, that an ideal medium would be a multicoated film in which each layer would be sensitized to one of the primary colors and would, after exposure, be easily and economically processed.
The following article is a translation from an original paper dealing with the new Agfacolor process, and is published here as an authoritative answer to the many inquiries received regarding this new method.
The film, as described below, is not as yet available to the American market, and we are unable to say at this time when it will be available. Production problems in this connection are now being investigated and an announcement will be made when the product is marketed.
(Editor’s Note)
In order to avoid the difficulties involved in making three separate color negatives by means of primary filters, it is necessary to use a film on which three separate sensitive emulsions have been coated — the first being sensitive to blue, the second to green, and the third to red. If suitable emulsions are chosen and coated in this manner, a film is obtained which is similar to the "Tripack" material, except that the emulsions are not separated but are coated on a single strip of celluloid.
The first step — that of exposure — can be carried out immediately with such a film, for each emulsion layer will behave as if it were a separate negative under an appropriate filter; and if the entire film is developed and reversed to a positive image, each emulsion layer will register a suitable positive image for color formation. Thus, the top emulsion layer will render a blue-color-separation positive, for this layer was only sensitive to blue. Correspondingly, the two
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