"The unique processing of Kodachrome using the introduction of the dye
couplers during developing solved the problem of dye coupler migration to
other color layers, one that both Agfa (the other film giant at the time)
and Kodak were pursuing in a technology race during the 1930's."
Kodachrome also had troubles with dye-coupler migration. The "original"
Kodachrome developing process used "controlled" (hah!) diffusion of the
couplers. The problem is that diffusion is necessarily imprecise, and some
of the yellow coupler is going to get into the green and red layers, etc.
The solution turned out to be surprisingly simple. You let a dye coupler
penetrate all three layers, then flash the film with the corresponding color
of light (eg, red light for the cyan coupler). Then, after second
development, you flush out the residual coupler and repeat for the other
magenta and yellow couplers.
As Dr. Land ("he" to Kodak) liked to say, "Creativity is the sudden
cessation of stupidity." This is a classic example.
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