Yellow is a primary colour
It’s one of the colours of the rainbow
On the visible light spectrum yellow has a wave length of about 570 nanometers
In psychology yellow suggests happiness
In the 17th Century painters used Indian yellow made from the concentrated urine of cows that lived on nothing but mango leaves
Yellow has a stimulating effect on the mind
Taxi entrepreneur John D. Hertz painted his taxis yellow based on a University of Chicago study that claimed yellow is the colour most easily seen at a distance. It seemed to catch on!
People notice yellow quicker, even from the corner of their eye. Lateral Peripheral vision for detecting yellow is 1.24 times greater than it is for red.