>How do I read more about this "not being in the rainbow" aspect of this color ? By a color "not being in the rainbow" we mean that if you take light and spati

>How do I read more about this "not being in the rainbow" aspect of this color ? By a color "not being in the rainbow" we mean that if you take light and spatially separate its different frequencies (like what happens in a prism or droplet of water), none of those individual frequencies will produce that given color response. And no, it's not that interesting. Almost all color perception experiences involve stimulating a patch of retina with multiple frequencies; we've given names to many of those experiences.