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US Scientists Say They’ve Found A New Color—“Olo,” A Vivid Blue-Green—By Firing Laser Pulses Into 1 Eye Of 5 People, All With Normal Color Vision, Stimulating Only M Cone Cells (Green) Out Of The Eye’s 3 Types: S (Blue), M (Green), And L (Red). This Rare Activation Created A Color Unseen In Nature, Possibly Aiding Color Blindness Research.

https://www.bbc.com/news/articles/clyq0n3em41o

“Olo” is said to be a saturated blue-green – but some say the existence of a new colour is “open to argument”.