In this process, two positives, one orange-red one blue-green, were cemented together. Several specifications and modifications exist, for instance the strengthening of the perforated film margins via a second exposure, in an attempt to overcome wear and tear, common problems of cemented films, or a four-color version. Furthermore, Thornton also worked on a mosaic screen process, which he combined with the beam-splitter in order to obtain three color separations.
Anonymous (1926): Thornton Three-Color Cinematography. In: The British Journal of Photography, Feb., p. 8.
Anonymous (1927): Der Thornton Farbraster-Kinofilm. In: Die Kinotechnik, 9,11, p. 288. (in German)
Anonymous (1928): Thornton Color-Cinematographic Patents. In: The British Journal of Photography, Aug., p. 31.
GB 238 688; GB 272 986; GB 273 056; GB 274 591; GB 275 331; GB 285 262; GB 285 228; GB 285 227; DE 549 598; DE 594 068