Here is the Kodak Chronology of Motion Picture Films:   http://www.kodak.com/country/US/en/motion/...t/chrono3.shtml   http://www.kodak.com/US/en/motion/about/chrono4.shtml       ECO EASTMAN EKTACHROME Commercial Film 7252 was a camera reversal film that had a fairly low contrast, intended for duplication by printing onto a reversal print film, or making an internegative (on 7271 or 7272). It was often favored for films originating in 16mm at the time because it had a finer grain str