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Printing from Screen Plates 557
alternate picture. For the use of screen-plates for cinematography generally see page 602.
G. S. Whitfield4" proposed to coat glass with a weakly colored screen, and then with emulsion, and to place the same in register with a color record, which might be either a negative or positive. Exposure was to be by white light through the record and the image reversed, if the original wa> a negative ; or a process might be used that would give a positive direct from a positive. The screen and picture was then to be stripped and transferred to paper. In a later patent47 paper with a light-sensitive emulsion was saturated with water till expanded to its fullest extent, and in this condition applied to the color record, exposed and immediately developed, fixed, washed and applied to the viewing screen by daylight, and permanently secured, while in its expanded state. The viewing screen was to be preferably on a temporary support and then stripped with the combined color record.
M. F. Ungerer48 would make three negatives by using subtractive light filters and printing successively on one surface. A cyanotype print was to be made from the red-filter negative, varnished with lac varnish, coated with dichromated gelatin, printed under the blue negative and dyed up in aurophenin. A coat of colloid was then applied, another dichromate coat and this dyed up with erythrosin.
J. and E. Rheinberg49 proposed to make multi-color prints by successive printings, in which the colors were only superposed in parts leaving a certain number of differently colored dots. Such prints were improved by causing adjacent dots to transfuse or merge so as to act on the subtractive principle. To obtain better gradation, the color print might be transferred in register to a black and white or monochrome positive.
H. Hess50 would make the three constituent negatives by printing under the usual three filters, and from these make prints on dichromated colloid on celluloid, printing through the hack. A cyanotype print might be used as a base and the other colors superposed as reliefs. F. E. Ives51 would do away with the making of intermediate negatives by printing on to an emulsion in the usual way, then hardening the gelatin in situ with the silver with dichromate and dissolving off the soft gelatin, stain up and superimpose the red and yellow on a cyanotype print.
F. M. Warner52 would make a monochrome positive from a negative screen-plate on panchromatic emulsion, by the use of "balanced conditions," that is to say, the emulsion must be equally sensitive to all colors, or a compensating filter must be used. The positive thus obtained was bound up with a screen-plate, and in preference with one of the linear type, such as the Warner-Powrie. R. L. Stinchfield'3 would utilize a twocolor method but distribute the filter areas between two supports. Fig. 147 will enable the principle to be grasped, and / represents one of the elements with the sensitive coating broken away; 2 is a test chart; 3 repre