I must respectfully disagree with my potentate Ron... the Capstaff's look absolutely beautiful to this day! There are a collection of 8x10 glass portraits and still lifes at GEH and they're stunning; legitimately.
2.5 colors; that's an interesting way to look at it. I am surprised that Technicolor would have used a mixture of dyes for the reasons above, but it's certainly possible that two dyes could be found with a close-enough pH/contrast relationship. Kodak DT though, definitely only used 1 dye for each sep.