It's derived from the French word 'Bleu' ..
because it's blue.
Blue Heelers are called "blue" because of the color of their coat, which is a shade of blue-gray. This color is a distinctive trait of the breed and is the reason for their name.
The color of the mixture of green and blue light is called cyan.
no just light blue or dark blue really
puce.
When you mix blue and purple together, you get a color that is a combination of both, which is called indigo.
In this question the color blue (the color of sky) is already given the name rain.
Indigo
The color sky blue is a lighter shade of blue. The color is called sky blue because it is to resemble to same color as the sky. When the sun is out the sky is a beautiful shade of blue.
When red is mixed with blue, the resulting color is purple. This is because red and blue are primary colors that combine to create a secondary color.
blue and white
The color violet is also called purple. It lies beyond the color blue in the spectrum.
BLUE