Well, I will re-word part of my statement. One man's neutral tone is another man's cool tone.
If you open the images and sample these colors out using Photoshop so you can view them independent of any other color reference, they do even appear to be a green tone. But that does not mean that a green pigment was used. Ivory black mixed with Yellow ochre and white makes a greenish tone that is also considered a neutral by some. I do not think Marvin is wrong, I think we are really caught in semantics here. Just what is a cool tone? In comparison to the other skin tones the neutrals are cooler. That does not mean they are blue or green (although they can appear to be.)
I have a question if you had a warm skin tone made from YELLOW OCHRE, LIGHT RED and white, what color would you use to neutralize it? Even if you use a blue black you are using a cool color to make a neutral. That is the crux of this discussion was a cool pigment added to the skin tone to make the neutrals or cool tones in these paintings. If I remember right Rembrandt did not use a blue as we might think of such as ultramarine or cerulean, but he did use ivory black which is a blue black.
So did he mix this cool pigment in the neutral skin tones? I do not know but I sure would think he did, unless someone can tell me what colors would make this greenish neutral other then a Ochre mixed with some bluish color. Raw Umber is a yellow brown and I suppose it could be used in the place of the ochre but I still think that some bluish pigment was used. Of course I do not know for sure; also it could just be the greenish under painting showing though.
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