Appendix D: S E N 3:

Successive exposure negative 3. S E N 3 is a method of motion picture color photography in which three color separation negative images were recorded on one strip of film by photographing each frame three times successively through red, blue, and green filters. The resultant negative was subbsequently optically printed by the use of a skip-frame mechanism. The process was restricted to the photography of animated cartoon and puppet subjects in which the movement from frame to frame could be controlled. The successive exposure process was rendered obsolete by the introduction of 3 layer (multilayer) color negative film.