Garth, I am going to make a mixture of Raw Umber and Ivory Black 1:2. From this I will make a scale of 20 shades by mixing with Zinc White or Titanium White.
I have to do some tests to decide how it works. Maybe the Zinc White is too weak in color intensity.
Then I will make a colorcard with these colors. In that way I will have a direct reference to my mixed color scale.
That way it will not be a problem if the scale is not perfect balanced.
Allan
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