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Screen-Plate Patents 501
The process might be varied by using blue-green grains and toning the silver red.
J. Marchand134 obtained a somewhat confused patent, which apparently starts with a bleach-out process, then utilizes a screen-plate method in which black is formed by a mixture of three colors and yet light is supposed to traverse the "molecules" and act on a panchromatic plate. And two images were projected in superposition by two lenses. R. Demoulins de Riols135 proposed to use red, blue and yellow flashed glasses and to prepare the constituent images as resists and etch the glass and superimpose. L. Paris and G. Piard136 would substitute phosphorescent grains of zinc sulfide for the starch grains of the Autochrome plate. They were successively treated with alum and ammonia solutions and the gelatinous alumina stained up.
W. R. B. Larsen137 proposed screens with portions of the lines transparent, in order to secure a varying effect in the high lights and half tones. Transparent or translucent color flakes were superposed on the transparent parts on the cover glass of the screen, so that when the two glasses were placed together the light openings were covered by the flakes. R. Lehner138 patented a process for incorporating dyes with celluloid by grinding it with semi-alcoholic solutions, and when the mass was homogeneous, the water was driven off by heat and the celluloid worked into films.
L. Gimpel139 patented a screen composed of parallel lines photographed on an ordinary plate, and after development the image was toned a primary color, as red. The film was then coated with sensitive emulsion and the screen photographed again but with the lines at right angles to those of the first time, this second lot of lines was toned blue-green. The plate was again coated and exposed through the lines already formed and this image toned yellow. F. Faulstich140 proposed to spray a base with dyes, then immerse the film in others. This immersion might affect those parts already sprayed or the sprayed parts might act as a resist, and subsequent to immersion in another colored bath might be washed away, and all colors thus produced.
The Compagnie Generate £tablissements Pathe141 gave constructional details of an apparatus for the manufacture of dust-like particles from colored resins or other colloid solutions. H. N. Holmes and D. H. Cameron142 disclosed the application of an emulsion of gum dammar and dyed gelatin. A. Gleichmar143 colored the film support with areas so that there would be no error from shrinkage of the film differing from that of the elements. M. Jeanson144 proposed to expose a Lippmann plate in the usual way in contact with mercury, the plate being sensitized with dichromate. This was to be used instead of the usual colored element plate.
K. E. Stuart145 patented the use of bands of orange overlapping red, blue and violet, so that red, green and violet would be formed. Or lines miofht be crossed to form mosaics. This was stated to avoid the forma