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I find that using colors that are close to the desired color is the easy way.
To mix a gray I use Raw Umber and Flake White. To get it greenish, use a dab of Raw Sienna or Yellow Ocher. To get it colder, use Ivory Black or Ultra Marine. To make it warmer use the Red Ocher from your skin color.
I know that you can mix the same colors with the spectral colors and get some interesting grays - but can you do it again ?
Allan
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