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Well now.....
I took a chance and did the mixing with one part Raw Umber + two parts Ivory Black and mixed with different quantities of a fifty-fifty Zinc White and Titanium White.
The colors shades came out in fine steps that led me to think that the system works.
But when I afterwords painted the value scale I had to face that it was not satisfying. Taking from light to dark the values range was steep at the beginning and flattened out in the dark end, which means that the white paint don
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