Why are police reports always blue with white letters?

Blue represents courage, calmness, reason, and never giving up. The blue background is used exclusively by police officers, and police uniforms are navy blue. All police exterior signs are painted in police blue, which is uniform across the country.

Blue is easy to identify and is not occupied by other industries. Among the seven basic colors of nature, red has long been occupied by fire fighters, and white is the color of most buildings. Green is the color of nature's plants.

Extended information:

It has been proven through countless experiments that white characters on a blue background are the clearest and easiest to read. Things related to the police profession, such as public security slogans, exterior wall decorations of public security agencies, unit name pendants, etc. are all blue.

Psychologically speaking, blue subconsciously gives people a sense of comfort and security, so for authority figures, blue is the first choice of the police.

The white text on the background is the most eye-catching pair of contrasting colors and the clearest! Some netizens said that the brightness of blue and white is low, and blue also means rigor. Overall it's quite eye-catching.