My favorite color is blue, it's a great color.
You mean Blue as in one of the three primary colors in the traditional color theory? 
Yes that color blue. It is cool how it's a primary color. There are 3 primary colors right? 
Yes, they are known as color theory. your eye on see's blue light between wavelength between approximately 450 and 495 nanometres. Any thing else and you can not see it.