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
That's true I definitely think of police uniforms when I think of blue. I read that Chinese artists used cobalt blue for porcelain in the 8th century, how cool.
Sometimes the color blue is associated with sadness, like a blue christmas
Red states and blue states
Since the 2000 United States presidential election, red states and blue states have referred to states of the United States whose voters predominantly choose either the Republican Party (red) or Democratic Party (blue) presidential Since then, the use of the term has been expanded to differentiate between states being perceived as liberal and those perceived as conservative. Examining patterns within states reveals that the reversal of the two parties' geographic bases has happened at the state level, but it is more complicated locally, with
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.