Do color negative films have 3 color dyes in them?

[Vivaldi]

Do color negative films have 3 color dyes in them?

[MrOracle]

Yes.

The first color processes used two separate film strips and captured 2 colors on the negatives and could only reproduce a limited color palette. Technicolor used 3 film strips and captured red, green, and blue on separate strips. But these required huge, heavy cameras that severely limited camera movement, and needed massive amounts of light, so they tended to be used only for movies shot in studios (rather than on location), and only those where they could get away with limited camera motion.

3-strip Technicolor camera

Inside a Technicolor camera

Kodachrome was released in 1935, which was for still photography, but was the first widely used commercial single-strip color film, and used 3 color layers on the negative.

The first widely used commercial color single-strip movie film was Eastmancolor, the forerunner of the movie film still used today, and it also used 3 layers of color on each frame. This was the main color film used from its introduction in 1950 through the early 1970s, when it was replaced by ECN-2, a newer, improved process that required different (and faster) developing. The first ECN-2 film was Kodak 5254 (Jaws was shot on 5254), but a couple of years later Kodak 5257 was released, and most movies from 1976 to the early 90s were shot on 5257, including just about everything from Lucas, Spielberg, Cameron, and other big movies of that period. Modern films are really just refinements of these, with better color accuracy and better light sensitivity.

[Vivaldi]

Kodachrome isn't a negative film but a reversal film.

[Anonymous]

Yes, believe it or not they do.