answer:It’s not really possible for there to be a ‘new color’ in the sense of a color we have somehow missed, as color is a result of light reaching our eyes, and the visible spectrum is rather well characterized. That is, in the range of spectrum that we see. However, it is absolutely true that we cannot see the full range of color, as we see a very tiny portion of the spectrum of light. Many animals see farther. Many snakes can see in the infrared (‘heat vision’), and many insects can see into the ultraviolet. And of course there’s still a huge range beyond that. What those colors look like, well, your guess is a good as mine. Now, colors that don’t originate from sight, say, instead coming from a drug-induced hallucination, may result in something that can’t be found in the true visible spectrum. But that I have no experience with.