Optics. In optics, the word "pink" can refer to any of the pale shades of colors between bluish red to red in hue, of medium to high lightness, and of low to moderate saturation.

Why pink is not a color?

And since light being reflected by objects is what gives them a color, some think this means that the color pink doesn't really exist. In reality pink is an illusion created by our brains mixing red and purple light — so while we see the color pink, it doesn't have a wavelength.

Is pink shade of red?

Besides being a light tint of red, pink is often considered to be a basic color term on its own.