Quote Originally Posted by Rhodes View Post
Heres something from 1927, let's see if one can find out the process used.

http://www.youtube.com/watch?v=TwahIQz0o-M
I don't remember the name of the process but it involves shooting alternate frames through red/green filters and then projecting them through their complimentary filters. You can see a flicker between the two colors and notice that when someone runs across the screen they blur into red and green people because the frames were not exposed simultaneously.

edit: AHA! http://www.widescreenmuseum.com/oldcolor/kinemaco.htm