Black on the color spectrum While there’s no black in a rainbow, photons anywhere in the electromagnetic spectrum can be seen as black. Or in some cases, they can’t be seen at all!

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!