Judging from the poster, there isn't anything true about the colours.
Trucolor was introduced by Republic Pictures (a second or third tier movie company) as their in-house motion picture process. It was meant as a competitor to, for example, Technicolor, but was a very poor relation.
@fitheach It's hard to beat Technicolor. Whenever a 1960s Technicolor film pops up on screen, it's so obvious. They hit on a graduation that is somehow just very pleasing to the eyes.
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