The color magenta is not physically exist. It's just an illusion of minds.

blog.asmartbear.com

3 pointsnaruil3 comments

It shocks me that the magenta is not on the physical spectrum. It means that there is no such a frequency that produce the color magenta.

Brown is another strange color.

Slightly more common example of "colors" that doesn't exist in spectrum are white, all shades of gray, and black :)