Described as a kind of blue-green, the new color—named “olo”—can only be seen using lasers to manipulate certain ...

Where does black fall on the color spectrum ... Consider the optical illusion that consists of a light rectangle next to a dark rectangle. Each rectangle contains a circle.

Well, you might have to start re-learning. At least, when it comes to one color people think is on the spectrum. Popular Mechanics reports that purple is a “pigment of your imagination”: The ...