: As a person with red-green colorblindness, I'm not sure how I should feel
: about this. :-/
I've done enough research to form a hypothesis that reds and greens to us trichromats appear as hues of yellows to you. Are any of those words different from the others? Try playing around with the first four hex digits in the font color value.
Our medium cone is in perfect position to split "yellow" into green and red. Colorblinds have it replaced with a mutant cone that is either slightly longer or slightly shorter. From this, I have logically deduced that tetrachromats and pentachromats take it to the next level: they have split yellow into three subcolors rather than our normal two, and pentachromats have four new primary colors that make yellow combined.
But wait, there's more. Your "yellow" may be more of an Orange or chartreuse depending on which mutant cone you got, and your blue is probably more what we perceive as azure or turquoise, without our hard blue between the two. but also without the green that is apparently part of those shades, because that distinctive color is swallowed by halves into your blue and yellow.
So because pentachromats exist, I'm always wistfully wondering about the mysterious subcolors that make green and red, because that is my inevitable conclusion: red is a combination of two colors that we trichromats can't even comprehend, as is green. And it goes deeper if the potential number of cones is unlimited. It actually is limited by the planck length, but consider the majestic mantis shrimp with its sixteen-cone hexadecachromatic vision.
