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I was thinking of optical red: it is redder than the skintones. But maybe that is simply a darkening effect, i.e., the mixing of the light refracting off the lit surface of skin combined with the color of the background. Certainly the halo of white is like a darkened white, not tending towards yellow.
Julie, in that portrait by Kramskoy, it's the opposite effect: a halo (or inverse circle) effect of the light background intruding into the edge of the darker figure! How clever of you to notice the relationship between this and what we have been talking about! Wow, this is getting exciting. I think the two phenomena are definitely two sides of the same coin (I'm not sure how coins come into this, but anyway...).
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