Haven't seen it but generally a bit of under exposure (transparencies)
increases saturation.  Printing down a negative does the same.

Contrast can be induced/controlled when lighting.  Processing can also
bump/decrease contrast may also result in color shift.

Read up on "low key".

--
dadiOH
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At the printing stage saturation can be increased as follows (I am quoting from
a post I made four years ago):

The technique is described in the booklet "Perfect Color Printing" from
Photo Techniques Magazine. It was stated there for the EP-2 method, but
I have successfully applied it to RA-4 chemistry.

Here are the steps:

1.    Expose as normal
2.    Develop in color developer as normal
3.    Fix in B&W fixer for 2 minutes
4.    Wash thoroughly
5.    Bleach in 2.5% solution of potassium ferricyanide (w/ 7g potassium
bromide) for 2 minutes +
6.    Wash thoroughly
7.    Redevelop in color developer
8.    Either repeat from step 4 to further increase saturation or use
bleach-fix as normal
9.    Wash and dry.

The reason it works is explained by Dr. Chapman in his article "The
Photochemistry of the Anderson Method" contained in the same booklet.
There are always unused color couplers in conventional color emulsions.
Recycling the silver halides allows the activation of further color
couplers from the appropriate dye layer.

Francis A. Miniter

excellent exposure and lighting, large soft light source, background subdued
tones.