My favorite color is blue, I love all shades of it, do you like blue?
Blue is one of my favorite colors too, I like how it falls between violet and green in the visible light spectrum.
In the Middle Ages, European artists used it in the windows of Cathedrals
Wow that's really neat, I like how some shades of blue contain other colors, like how azure contains some green in it.
Blue became a popular color for military and police uniforms as well as business suits
An optical effect called Tyndall scattering explains blue eyes. Distant objects appear more blue because of another optical effect called aerial perspective.
Blue has been an important colour in art and decoration since ancient times. The semi-precious stone lapis lazuli was used in ancient Egypt for jewellery and ornament and later, in the Renaissance, to make the pigment ultramarine, the most expensive of all pigments. In the eighth century Chinese artists used cobalt blue to colour fine blue and white porcelain. In the Middle Ages, European artists used
worn by most national and corporate leaders. 
In science.
In science Optics.
Violet is at one end of the spectrum of visible light, between blue and the invisible ultraviolet. It has the shortest wavelength of all the visible colors. It is the color the eye sees looking at light with a wavelength of between 380 and 450 nanometers.
In the traditional color wheel used by painters, violet and purple lie between red and blue. Violet is inclined toward blue, while purple is inclined toward red.