Hello I am new to Blender. May I ask, is there a way to control the bounces that mix with the SSS shader?
For example, I have a ‘yellow’ SSS shader for the head and a ‘black’ SSS shader for the torso. In the occluded area of the neck, the colors are mixing and turning the neck green.
I would like to stop the neck from turning green.
What are your SSS radius numbers?
Hello SterlingRoth. these are my SSS radius numbers, I don’t think I touched them.
The SSS radius can cause color shifting, they essentially represent how far red, blue, and green are scattered separately. They kinda default to a fleshy color, so red scatters very far, green not so much and blue hardly at all.
in your case, I would try something like .5 .5 .1 and see how that looks.
here’s a link with some more info:
Thank you very much. 
Subsurface scattering uses the base colour as it colour with the new principled shader.
If you set the radius to a constant value (the same value for each rgb channel) the subsurface colour will be the just the base colour.
Reflections will tint on your shinny surface.
Thank you very much, DNorman. 
I forgot to mention that you need to set the SSS to “Christensen-Burly”, the random walk options add offsets to the radius values.
