Blue is one of the three primary colours of pigments in painting and traditional colour 
Cool, blue is actually my favorite color.
Why is blue your favorite color ,any special reason?
I have just liked it since I was a kid.
If you observe closely,eye perceives blue when observing light with a dominant wavelength between approximately 450 and 495 nanometres.Those are scientific anyway
Huh, cool. Wavelength creating color for us is really interesting,
Blue
Blue is one of the three primary colours of pigments in painting and traditional colour theory, as well as in the RGB colour model. It lies between violet and green on the spectrum of visible light. The eye perceives blue when observing light with a dominant wavelength between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colours; azure contains some green, while ultramarine contains some violet. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering.
it does not expose most photographic paper and some films. Today modern darkrooms usually use an amber safelight.
In science and nature In color theory and on a computer screen.
On the color wheel long used by painters, and in traditional color theory, red is one of the three primary colors, along with blue and yellow. Painters in the Renaissance mixed red and blue to make violet: Cennino Cennini, in his 15th-century manual on painting, wrote, "If you want to make a lovely violet colour