“Public showings of the work done at this plant in Hollywood have been given to Los Angeles audiences. The release prints are made on double sided film. Both sides are developed at one time and then toned red on one side and bluegreen on the ...

“The Dutch Sirius Color process (1929) used a camera with a beamsplitting system behind the lens to expose a single film, the film passing through two gates at right angles to each other. The double-coated print film was dye-toned. The process ...

“Two-colour additive process Talkicolor was developed by Percy James Pearce along with Dr Anthony Bernardi who was also involved in the development of Raycol. The process was funded mainly by the author Elinor Glyn through her company Elinor ...

The first subtractive 2 color process introduced by Technicolor captured the incoming light through a beam splitter with red and green filters also. However, in contrast to the first Technicolor process, the two b/w images were recorded on one negative strip. This was achieved by the pull-down of two frames simultaneously, a process that required the double speed in the camera. These two frames were arranged in pairs, whereby the green record was inverted up-side down (see image).

“By the 1940s, most of the two-colour subtractive processes, apart from Cinecolor, were obsolete. The widespread use of the high-quality Technicolor process showed up the serious deficiencies in the simpler methods. The only significant new ...