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MOTION PICTURES IN NATURAL COLORS 27S
film, carrying only a gelatine coating. The two images arc printed onto this film, one over the other, exactly as colored pictures arc printed for a magazine. This is known as Imbibition printing, and has long been a recognized method of producing still color-photographs, but has not been successfully applied to movies before on account of the way the colors spread or diffuse on the film. This causes a lack of sharpness, but the latest examples of Technicolor indicate that this has been almost completely overcome. Incidentally, the process can easily be adapted to three-color work if need be: and there is reason to believe that it soon will be, if it has not already been.
And now comes Multicolor, a color system which is attracting world-wide attention because with it neither special cameras nor additional lighting are required. This color company has introduced a new Rainbow Negative during the past year which is of farreaching importance for it brings an already highly perfected process into exact production equality with existing monochrome practice. In short, by obviating the necessity of special cameras and additional lighting it gives color on a black and white basis. Multicolor is at present a two-color, subtractive process which may be employed in any standard motion picture camera using demountable outside magazines. Aside from the use of a special double magazine, and a slight adjustment of the film-gate, there is absolutely no alteration to the camera. The prints may be projected in any standard projector. The secret of the process is its double negative which serves at once as film and filter.
Instead of securing the two necessary color-separation negatives by the use of prisms or rotary filters, Multicolor uses two films, which are exposed together, with their emulsion surfaces in contact. The front negative records the blue-green components of the scene, and has incorporated in the outer surface of its emulsion an orangered dye which is photographically equivalent to the No. 2 3A Wratten filter, and acts as such for the rear film, which is practically a standard Panchromatic, and records the orange-red components only. Since no prisms are used, the negative images are naturally in perfect register, and can be made critically sharp. Since they arc made simultaneously, there can be no "fringing". The laboratory treatment of these twin negatives is exactly identical to that of black-and-white negatives. The prints are made on a special, doublecoated positive stock. This has an emulsion coated on either side, in each emulsion being also a yellow dye to prevent the fogging of the opposite print. The print is developed in the normal manner, and the two sides are colored, one orange-red, and the other bluegreen. The actual toning process used is an ingenious combination of chemical and dye-toning, selectively coloring the respective images. Since the print is not made by dyestamping, and since the original negatives can be made perfectly sharp, a Multicolor print can be made as critically sharp as could be desired. When colored and dried, the print is carefully varnished, and is thereafter ready for duty. This varnishing process is of the utmost importance, for