Three-layer color:

Film with three layers of emulsion on a single strip of film.  Each layer is sensitive to one of the three primary colors of red, green, and blue.  Beginning in the early 1950s, color film work has been done primarily on three-layer, also called multilayer, film.  Frequently used three-layer color negative films are Eastman Color and Fuji Color.  A three-layer negative may be printed onto three-color separation master positives.  Brand names associated with this color separation process include Columbia Color and Supercinecolor.