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256 COLOUR FILMS EXPLAINED
packed together and the light passes through them simultaneously. The one sensitive to green runs through on its own.
An arrangement of prisms and mirrors splits up the light coming through the lens into three grades and passes them on through appropriately coloured filters before they reach the films. Thus the light which is split by the prism and reflected through filter number one records only green on film number one. The light which is reflected in the opposite direction falls on films numbers two and three, the two films which are packed together. This is red and blue light together, but the emulsion on the front film is only sensitive to blue rays, so it records only blue. Red, being the stronger colour, passes right through the front film and is recorded on the rear-most film.
These three negatives, however, are not in themselves coloured. They are black and white, but each one is different because it represents only about a third of the scene as recorded by the lens and filtered through to it — one negative is the green third, the second the blue third, and the last the red third.
In the laboratory, the negatives are developed and chemical solutions, in a bath, dissolve away all extraneous matter, leaving each colour-record on each frame of film slightly raised — in short, each frame has become a rubber stamp.
The films are now soaked in baths of dye, but each film is dyed, not the colour it recorded in the camera, but its complementary colour. Thus the blue is dyed yellow, the red is dyed blue-green, and the green is dyed magenta.
The negatives are now re-named colour matrices, and here the laboratory workers leave the colour process and turn their attention to the sound track, which is in black and white. This is printed down the side of the positive film which they are about to make.
Now, with the sound track printed in black and white, they start to put the coloured pictures on the rest of the film and they do it very much as a printer prints a picture in three colours. First the red matrix is pressed against the positive film. You will remember that the red matrix was dyed its complementary colour, blue-green. The dye is absorbed by the positive. Then the green matrix is pressed against it, leaving its record of magenta dye. Finally the yellow dye from the blue matrix is pressed against the positive, a positive which has now become a three-colour film.
It requires no special projector to show a Technicolor film and