Quote Originally Posted by Photo Engineer View Post
I don't think that a workable color negative additive system has ever been demonstrated.

Dufaycolor was used in a small number of 35mm movie films in the 1930's, in a color neg/positive film format. I've seen some on video and the results are entirely usable, if not up to some other systems. I believe that difficulties included, registration of the screen in printing, slow speed of the film for studio work and loss of brightness in projection due to the screen, so it was never widely adopted.