Subtractive 2 color: Bi-pack, double-coated print
L. J. Dassonville
Klein, Adrian Bernhard = Cornwell-Clyne (1940): Colour Cinematography. Boston: American Photographic Pub. Co.. 2nd revised edition, pp. 210-211.
Cauda, Ernesto (1938): Il cinema a colori. Quaderno mensile. Roma: Bianco e nero, anno II, nr. 11, on p. 48. (in Italian)
Timeline of Historical Film Colors by Barbara Flueckiger is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Quote as Flueckiger, Barbara (2012 ff.): Timeline of Historical Film Colors. (= https://filmcolors.org/).