Because the messenger pigeons are normally blue pigeons
In earlier days blue pigeons used to bring and take messages. So, bells were tied to their feet so that their owners could identify them from the bells tied on their feet.
blue or clear
Blue
It would still look blue :)
BLUE
Blue
blue
BLUE
Blue Bells Model School was created in 1980.
Blue Bells Model School's motto is 'Be Honest, Be Brave'.
Mixing yellow and blue will result in green, in relation to the percent of mixture of the two colour.
You would get the color teal or turquoise when you mix blue and green together.