Richard,
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You just go heavier on the sap green, dull it with alizarin, and lighten it with cadmium yellow.
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About two years ago I started using Grumbacher's Thalo Yellow-Green as a neutralizing color for the red/orange/yellow bse in skin tones.
When you squeeze it out of the tube, it looks like a neon mistake, but it has the advantage of desaturating the reddish color, without changing the value, which in turn eliminates (or at least reduces) the need to use white to return the mixture to the desired value.
Cynthia, How exciting! His site will be spectacular, I have no doubt.