I'm not trying to draw away from this, but to augment it, in that I found experimenting with John Howard Sanden's paint system equally as interesting and useful, in that he also grays his colors with grays. Of course, a lot of folks protest that they're premixed grays, and those folks remain free to spend the time mixing their own (arriving, eventually, at the premixed mix, while time marches on), but the lesson is the same. You're ahead of the game by not altering chroma in a way that alters value. Once you introduce two variables, you begin to lose control.
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