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COLOR
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using red and green primaries are yellow, true blue, violet, heliotrope, purple, and the rest of the blue-violet series. Also, all yellows tend to appear orange on the screen when this process is used.
Multicolor
This is another form of the subtractive process, which uses two color primaries slightly different from those on which the Technicolor process is based. The Multicolor primaries are blue and orange-red.
The Multicolor apparatus is, however, much simpler than that used by Technicolor. It uses any standard motion picture camera, without prisms or color filters. Multicolor furnishes a special attachment which requires only a few minutes to adjust to the camera, and a special magazine containing two films, which are threaded together through the camera, instead of the single film ordinarily used.
These two films are placed emulsion to emulsion, so that the light coming through the lens of the camera shines against the celluloid side of the front film. The front film is covered with an emulsion which records the blue and green end of the spectrum. In other words, a blue-green picture^ of the object in front of the camera lens is recorded on the front film.
The emulsion on the front film is surface-dyed red, which acts as a color filter for the emulsion on the second, or back, film. The light from the object photographed, after passing through the front film and recording thereon a blue-green picture, passes through a red filter at the back of this film and so photographs a red-orange picture on the back film. Then the two films are separated, de