Word: bonamico
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...Dufaycolor process owes much to a French engineer named Charles Bonamico, who worked out a way to cut fine, parallel lines on a steel roller-500 lines to the inch. The film is first dyed blue. It is then run through the roller which by means of a greasy resistant fixes the dye in a series of tiny parallel lines across the film. After bleaching and cleaning the film is dyed red and again put through the roller which this time fixes the second color in the minute spaces between the blue lines. Finally the film is dyed green...
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