More than 4

Meny men insist that there are actually only 4 colours, red, blue, green, yellow. They also acknowledge white and black. Now scientist have come up with a reason for this limited view.

Women may be able to see more subtle shades of red than men, research suggests.
Arizona State University scientists have discovered the gene which allows people to see the colour red comes in an unusually high number of variations.
The gene sits on the X chromosome, which means women have two copies, and men just one.
The researchers believe this could mean that women may have a more acute perception of the red-orange spectrum.