For the first time, humans might have glimpsed the rainbow of color that lies just beyond our sight – including a "blue-green of unprecedented saturation". You've never seen it before because you can't.

Researchers behind a recent study claim to have discovered a new color that the natural, naked eye cannot perceive — 'olo,' a hyper-saturated blue-green that occurs when a single kind of cone cell is stimulated in the retina.

The color, dubbed olo, is described as an intensely saturated teal. Researchers say it might have applications in understanding color blindness