Blue is my favorite color.
Blue is a great color! There are so many different shades! What's your favorite shade of blue?
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.
Sapphire (color)
Sapphire is a saturated shade of blue, referring to the gem of the same name. Sapphire gems are most commonly found in a range of blue shades although they can be many different colors. Other names for variations of the color "sapphire" are blue sapphire or sapphire blue, shown below.
Sapphire.
Displayed at right is the color sapphire.
The first recorded use of "sapphire" as a color name in English was in 1430.
Variations.
Variations Sapphire blue.