The test is a color spectrum consisting of 39 unique colors. The number of hues a person can differentiate on the chart points to the amount of color receptors, or cones, that person has.

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 human eye doesn’t actually see purple.

Color perception depends on the surrounding environment. Michael J. Murdoch In a smooth gradient from gray to black, where does black begin? Michael J. Murdoch Hello, curious kids!

We all think that the visible spectrum of light — every color we can see — is represented in the rainbow. But this isn't actually true. When you hold up a crystal prism to a beam of light, you ...

Researchers at the College of Design and Engineering (CDE) at the National University of Singapore (NUS) have developed a ...