Chaos has published a detailed explanation of sub-surface scattering. Read it on their blog.
Subsurface scattering explained
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I don’t mind Chaos explaining SSS, what i do mind is being stuck with an old and slow Al surface shader to do proper skin. And no for those who would point out, I say the sss in vray material is not the same result, its more wax like than skin like. There is a difference there.
Still waitin on a proper skin shader close to that of what Arnold provides with its SSS implementation and their RGB split.