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I haven't read every bit of this thread, but I think that no one has brought up the fact that a neutral color, when placed next to a color like red or yellow, will appear to be its opposite.
If you stare at a patch of red, then look quickly to a piece of white paper, you will see the shape of the red patch, but it will be green.
The same thing happens when you are painting red in a face, and then put gray next to it, the gray will appear green. If the face is orange, the gray will appear blue, etc. etc.. Andrew Loomis talks about this in the color section of his book.
For years I tried to put blue and green in portraits, because I can see it there. Then I realized that gray will look just like blue and green, and purple, if you are using red, orange and yellow.
Karin Wells knows this. Black is our blue, our purple and our green.
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