The film is recorded through alternating red and green filters, creating two color separations. After development, the print is placed in two alternating dye-baths, toning the blacks green and the whites red. Additionally, a black-and-white copy is developed, the final result consisting of two prints; one in color and one in black and white. In projection, the two prints are superimposed.
Donisthorpe was an avid inventor; for instance, he filed patents in the realms of stereoscopy, printing processes, cameras and sound.
Original Technical Papers and Primary Sources
Kelley, William Van Doren (1925): Color Photography Patents (cont.). In: Transactions of the Society of Motion Picture Engineers, 24, Oct., pp. 149–161, on pp. 150–151. Download PDF,
Anonymous (1913): Colour Cinematography. A New Process. In: The Bioscope, 346,XIX, May, p. 619.