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Double-Coated Stock
649
S. Procoudin-Gorsky42 proposed to print one of the constituent negatives on to ordinary positive film, convert the image into the complementary color, then recoat with a silver emulsion and print in registration the second image and repeat the operations for the third image. The same inventor described43 a printer for cine color films having recurrent series of color records. All the pictures of one color were first printed by stepping the negative three pictures to each step of the positive film. J. R. Hunt44 patented a machine for printing from negatives with alternately recurring records. The positive and negative films moved at the same rate of speed through different paths, so that the red records were printed at one gate upon alternate areas, and the green records at another gate, the lights being of different intensities. C. Paraloni and G. P. Perron45 patented a projection printer in which the images were reproduced in smaller dimensions on one side of the middle line of the film, the other
Fig. 184. Brewster's U.S.P. 1,223,664 (Page 650).
color records being then similarly printed on the other side of the middle line. D. F. Comstock46 patented a printer in which the images were obtained in register by optical printing.
Dyeing Up the Images. — The dyeing or staining up of the positive images on double-coated stock naturally requires rather more careful treatment than single-coated, as each image must be protected from the action of the dye that is required for the other surface. The use of resists, either in the form of templates or locally applied solutions, involves a multiplication of operations, which in the handling of long lengths of film stock becomes time-consuming and, therefore, adds to the cost. The use of machines for applying the colors by means of pads, etc., by pressure, necessitates carefully constructed mechanism, so that other methods have found favor with inventors.