A subtractive two-color process developed by John G. Capstaff of the Eastman Kodak Research Laboratories.
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Two-Color Kodachrome test of Ned Wayburn dancers, shot by Eastman Kodak cameraman Joseph Di Nunzio in February 1923
Film Technology Frames Collection, George Eastman Museum, Rochester, NY, United States.

[Fox Film Corporation Kodachrome test] (c. 1930). The Two-Color Kodachrome process was licensed by the Fox Film Corporation in 1929 and was rebranded by the studio as Fox Nature Color or Fox Color. Some of Fox’s tests used Movietone sound printed in green.
Film Technology Frames Collection, George Eastman Museum, Rochester, NY, United States.

[Unidentified Eastman Kodak test film] (c. 1925). Two color records were captured simultaneously onto one strip of film using a twin-lens camera. The B/W panchromatic negative was advanced two frames at a time (eight perforations).

[Test Film – Elms Wide View Tests] (c. 1931). Ten 70mm Fox Grandeur Kodachrome cameras were built and initial tests were photographed, although no 70mm color prints are known to survive. This 70mm camera negative was recently identified in the collections at George Eastman Museum.
George Eastman Museum, Rochester, NY, United States.
Identification
Unknown. Frame dimensions varied, but were noticeably smaller than standards for silent and sound releases of the time.
Bell & Howell (BH) negative perforations from 1915–1930; Kodak Standard (KS) positive perforations from 1930–1931.
Duplitized (double-coated); B/W emulsions bleached and tanned, then dyed. The duplitized stock is slightly thicker than standard single emulsion film. Both sides display a clear relief pattern which is especially evident when tilting the film under overhead light.
Standard 35mm US Eastman Kodak edge markings appearing either red or green against a black background.
16 fps during the 1920s; 24 fps for sound productions. The camera operated at twice these speeds.
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The two-color process could not record the full spectrum accurately. It produced good skin tones (although somewhat pale), but was unable to render effective blues for skies or water. Color fringing may be apparent within the image as a result of spatial parallax or poor registration in printing.
Kodachrome Process
From 1929 Two-Color Kodachrome prints may have a variable density soundtrack, which was printed on the green-dyed side only, and therefore appears green.
Each frame was 4 perforations in height, but two frames were exposed simultaneously on the negative, then advanced together.
Eastman B/W panchromatic negative.
Standard 35mm US Eastman Kodak edge markings. The word “PANCHROMATIC” is also present.
History
Two-Color Kodachrome was the first successfully printed subtractive color process. At best it produced beautiful results, comparable, if not better, than many of the more well-known two-color processes of the time. Despite the expense and time put into its development by the Eastman Kodak Company, it never proved a commercial success. Its costly, complex and often imperfect printing was not suited to large-scale production.
The Two-Color Kodachrome process was developed by John G. Capstaff of the Kodak Research Laboratories. (Except for its name, it bears little resemblance technically to the later Kodachrome process developed by Leopold Mannes and Leopold Godowsky Jr. in the 1930s). Capstaff’s process was based on principles first discovered in 1912 when he was experimenting to obtain a method of reversing paper negatives into direct positives by bleaching. The refined process that was to become Two-Color Kodachrome, however, grew from commercial studies undertaken by Kodak for Percy Douglas Brewster in 1913, in an attempt to achieve a direct dye-image positive from a negative for his proposed Brewster Color process (Mees, 1914).
Although always intended for motion picture work, Kodachrome prints (which varied from Brewster’s process considerably) were first perfected in 1914 for glass transparency stills photography. The first motion picture tests were filmed in 1915, and in the following summer of 1916 a short film was completed entitled Concerning $1,000. It featured the friends and family of Kodak Research Laboratory staff and was partially shot in Kodak founder George Eastman’s gardens.
Kodak announced the process to the motion picture industry in 1922 with a series of trade screenings in New York and Chicago. It was declared that Two-Color Kodachrome produced promising results for close-ups, but was still being perfected for the filming of long shots (Anon., 1922). Soon after, the first commercial production to use Two-Color Kodachrome was released. The Light in the Dark premiered in August 1922 and featured several color shots of actress Hope Hampton, which were incorporated into a hand-colored historical flashback sequence. A week later, the opening program of the Eastman Theatre in Rochester included exclusive color shots of celebrities photographed by Capstaff in Hollywood. Among the stars filmed were Gloria Swanson, Agnes Ayres, Claire Windsor, Wanda Hawley and Shirley Mason.
A dedicated Kodachrome department was set up at the Research Laboratories in 1923 to handle a limited amount of commercial work, including some color advertisements and intertitles for outside clients. Between 1925 and 1928, Hope Hampton again appeared in color in a series of eight fashion shorts, which were produced in partnership with McCalls Magazine and distributed nationally by Educational Pictures. Development continued at Kodak even though the process was not being commercially exploited on any scale.
In 1929, a non-exclusive license for the process was entered into with the Fox Film Corporation (Sponable, 1930). Fox wanted its own in-house color process, which could operate cheaply without having to rely on an outside company, such as Technicolor or Multicolor. The studio invested heavily, building a fleet of 35mm and 70mm color cameras and two dedicated color laboratories in Los Angeles and New York. Several color productions were announced for release in 1930 under the trade name Fox Nature Color. However, in August 1930 Fox decided to drop the process before bringing any films to the public. After great expense and months of tests, it became evident that the complex Kodachrome printing could not be economically applied to large-scale commercial production. Kodak closed its Two-Color Kodachrome department in 1931.
Selected Filmography
Short demonstration film.
Short demonstration film.
Color inserts in seven short “magazine” reels screened exclusively at the Eastman Theatre in Rochester, NY.
Color inserts in seven short “magazine” reels screened exclusively at the Eastman Theatre in Rochester, NY.
Color short of Martha Graham’s dance first performed at the Eastman Theatre in Rochester, NY.
Color short of Martha Graham’s dance first performed at the Eastman Theatre in Rochester, NY.
Color inserts in a B/W feature film.
Color inserts in a B/W feature film.
Eight color fashion shorts with Hope Hampton.
Eight color fashion shorts with Hope Hampton.
Unreleased color insert in a B/W feature film.
Unreleased color insert in a B/W feature film.
70mm Fox Grandeur Kodachrome tests.
70mm Fox Grandeur Kodachrome tests.
Technology
Kodak’s first Kodachrome process was a two-color subtractive system of color cinematography. A twin-lens camera or beam-splitter lens attachment recorded two images simultaneously – one above the other, through a green and red filter respectively – onto a B/W panchromatic negative. The camera used an 8-perforation pulldown to advance two frames at a time. During the early development stages and tests a converted Gaumont Chronochrome camera was used, which ran at approximately 32 frames per second. Later, cameras were specifically manufactured for the process by Wm. P. Stein & Co. of Rochester. These were equipped to run at twice sound speed – 48 fps.
A Master Positive was made by direct contact printing from the camera negative, before a specially designed optical printer registered each color record on either side of a double-coated B/W duplicate negative. This would often require several attempts to achieve acceptable results. The negative would be processed, then run through a tanning bleach bath, which would remove the silver and proportionately harden the gelatin on both sides of the film support where the image had been. Each side was dyed the corresponding color, using dyes of the Pinatype family, which could only be absorbed by the non-tanned portions of the hardened gelatin. This resulted in a two-color positive image (Mees, 1921).
At the time, the exact dyes were not named, so were simply described as “Kodachrome Red” and “Kodachrome Green”. However, it has since been learned that the dyes were “Complementary Red D” (manufactured by Farbewerke Hoechst) and “Anthraquinone Green” (by Badische Anilin & Sodafabrik/BASF) (Eastman, 1914). The dyes were applied one side at a time by tensioned rollers to the duplitized film, then dried and fixed in the gelatin by passing through an acid alum bath. The intensity of either dye could also be modified at this stage to create a balanced color image.

Red and green color records were captured one above the other onto a 35mm B/W negative. After making a master positive, each color record was printed onto either side of a double-coated (duplitized) duplicate negative. The silver in the images was removed by bleaching, then the gelatin emulsions were partially hardened by tanning. After dying each side red and green, a two-color image was created.
Film Technology Frames collection, George Eastman Museum, Rochester, NY, United States. Diagram by Oleksandr Teliuk.
References
Anon. (1922). “Eastman Demonstrates New Color Process”. Moving Picture World, 55: 1 (March 4): p. 44.
Eastman, George (1914). Correspondence from Eastman to Wm. S. Gifford, Esq., August 29, 1914. George Eastman Legacy Collection, George Eastman Museum, Rochester, NY, United States.
Mees, C. E. K. (1914). Correspondence from Mees to George Eastman, November 2, 1914. Kodak Historical Collection #003, Rare Books, Special Collections, and Preservation, River Campus Libraries, University of Rochester, Rochester, NY, United States.
Mees, C. E. K. (1921). “Color Photography – An Authoritative Summary”. The Photo Miniature, XVI:183 (July): p. 125.
Sponable, Earl I. (1930). “Report on Eastman Kodak Company Kodachrome Color Process”. Color Process Committee. August 8, 1930. Earl I. Sponable papers, Box 48, Kodachrome folder, Rare Book & Manuscript Library, Columbia University Library, NY, United States.
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Author
James Layton is a film historian and archivist specializing in the history of motion picture technology. He is Manager of The Museum of Modern Art’s Celeste Bartos Film Preservation Center, and is co-author of two books with David Pierce: The Dawn of Technicolor, 1915-1935 (2015) and King of Jazz: Paul Whiteman’s Technicolor Revue (2016). Prior to working at MoMA, Layton was an archivist at George Eastman Museum, where he curated two gallery exhibitions celebrating CinemaScope and Technicolor, and the informational website Technicolor 100. He was project manager of the East Anglian Film Archive’s digital film archive and website relaunch in 2011, and also contributed to the Image Permanence Institute’s Knowing and Protecting Motion Picture Film informational poster (2010). More recently, he contributed a significant chapter on Eastman Kodak to FIAF’s expanded edition of Harold Brown’s Physical Characteristics of Early Films as Aids to Identification (2020).
David Pierce, Deborah Stoiber, Kathy Connor, George Eastman Museum.
Layton, James (2024). “Two-Color Kodachrome”. In James Layton (ed.), Film Atlas. www.filmatlas.com. Brussels: International Federation of Film Archives / Rochester, NY: George Eastman Museum.