eli5 what is the color grey

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wasn’t sure if i should post here or to nostupidquestions.

so i get that there 3 primary colors, Red, Blue, Yellow, combining them you get a secondary color.

add red and blue you get purple, add blue and yellow you get green, add yellow and red you get orange, combine all 3 you get brown.

So wouldn’t brown be a dark white or a light black since white is the presence of all color and black is the absence?

I think i also read somewhere that RBY only works for paint, but when it comes to atoms releasing photons, the three primary colors are RBG, in which case start from the top, go into the quantum chemistry if you need.

In: Physics