My son asked what you get when you mix brown and blue.. Not sure what to call it but found this guide along the way

Not necessarily when using pigments; there's a whole range of tonals that need to be accounted for and the "three primaries" most certainly cannot make every tonal value, hence the problem of the lie of black and white being mixes "of all colors (in the primary or secondary range)". If you really want black you have to use certain pigment shades that when combined in sufficient pigment density will absorb the entire spectrum, and all 3 primary, secondary, and tertiary sets when combined as individual pigments come close, otherwise you get mud.

The real kicker is when you learn that this isn't actually how the human eye even works which screws with that even more: we see based on the addition or subtraction of Scarlet/Magenta Red, Cyan Blue, and something closely approaching true Green, which is why old TV tube color guns and modern OLED and LCD displays use the same red/blue/green scheme instead of red/yellow/blue.

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