My favorite color is blue, whats yours?
Yes  mee too, Its primary colour. It lies eween violet and gree
It is also a color that calms a person when they look at it according to color psychology.
Yes, The clear daytime sky and the deep sea blue because of an optical effect
Yeah that is correct! In ancient Rome, blue was associated with barbarians
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.
, indigo gets its name from an object in the natural world—the plant named indigo once used for dyeing cloth (see also Indigo dye).
The color "electric indigo" is a bright and saturated color between the traditional indigo and violet. This is the brightest color indigo that can be approximated on a computer screen; it is a color located between the (primary) blue and the color violet of the RGB color wheel.
The web color "blue violet" or "deep indigo" is a