Eastman Color Negative, specifically abbreviated as ECN, is a photographic processing system created by Kodak in the 1950s for the development of negative motion picture film stock. The original process, now known as ECN-1, was used from the 1950s to the 1970s, and involved development at approximately 25° C for around 7-9 minutes. Later research enabled faster development (and thus quicker photo lab turnaround time) through the use of a higher development temperature of 41.1° C for around 3 minutes. This "hotter" development system is known as ECN-2, and is the standard development process for all modern color negative development, including even Fuji and other non-Kodak film manufacturers. All film stock types are specifically created for a particular process, and thus an ECN-1 film could not be put into an ECN-2 development bath; primarily, this is because ECN-2 film stock is hardened to be more tolerant of the higher temperatures of the bath. It has been suggested that this article or section be merged with photographic developer. ... Eastman Kodak Company (NYSE: EK) is a large multinational public company producing photographic equipment. ... For other uses see film (disambiguation) Film refers to the celluliod media on which movies are printed Film — also called movies, the cinema, the silver screen, moving pictures, photoplays, picture shows, flicks, or motion pictures, — is a field that encompasses motion pictures as an art form or as... Film stock is the term for photographic film on which films are recorded. ... Fujifilm TYO: 4901 , NASDAQ: FUJIY is a Japanese company known for its photographic film and cameras. ...

References

• Hanson, Wesley T. Jr. "Color Negative and Color Positive Film for Motion Picture Use." Journal of the SMPTE, March 1952, Volume 58, pages 223-238.