Try a tiny bit of black...I know when I use the air brush that is how I mute colors...
Hiya hun,
In color theory you add the complement (the color on the opposite side of the color wheel) to a color to mute it. You could add black but black has a tendency to "suck" light and make the colors dull not muted. So if you want to mute red add just a smidge of green. Same with blue or orange, yellow or violet. Add the opposite color and you get a not as vibrant.
Just a little som'in som'in I learned studying the impressionist artists.
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