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stevep-
There's two parts:
The Printshop will use CMYK in combination to macroscopically approximate the same spectra as the skin spectra. At a Microscopic level- well above particle interaction level- this looks like:
Which means that you are probably not going to get the same reflectance properties as skin, where pigmentation is a concentration dependent deposition of a single pigment, with a single spectra.Diffuse reflectance and scattering. (essentially a change in amount reflected due to multiple biological molecules interactions)
Couple them, and you don't have as close an analogue to skin as you might hope.
Aldosterone
So- there is a lot of work done on skin color interaction with wearables (this is at least part of my work currently)- it's just not that easy to solve, yet....
That paper above has a significant flaw, even if the outcome matches, due to additional overlooked (by the authors) complexities that aren't essential to the basic (well-understood) principle of darker= more aborptivity=less reflectance.