Trucolor 3 color

Subtractive 3 color: Color separation on DuPont Release Positive Film

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Iriscolor

Subtractive 3 color: Beam-splitter camera, imbibition printing
Similar to Technicolor, the Iriscolor process needed a special beam-splitter camera for exposing three black-and-white negatives on Kodak film stock. These negatives were used for imbibition printing. Between 1940 and 1942, Tobis Tonbild-Syndikat AG ...

Heliochromy color separation

Subtractive 3 color: assembly process, pigment process, still photography
“Carbon printing was originally a monochrome process. It was invented and patented by Alphonse Poitevin (1819–82) in 1855 and was the first practical printing method with pigments. After Poitevin, the carbon process was patented extensively ...

Ansco One-Strip Color-Separation Film, type 155

Subtractive 3 color: one-strip color separation
See Ansco Colorpak / Ansco Color, type 735, Ansco Color Release Film, type 732 and Ansco Color Duplicating Film, type 132.