Why is the police notice in white on a blue background?

Because the contrast of white characters on the blue background is obvious, it looks very eye-catching and will not be particularly uncomfortable, and the color matching of the police station is basically white characters on the blue background, so the mode of white characters on the blue background is adopted in color selection. Moreover, under limited conditions, white characters on a blue background are the clearest, and this color scheme is widely used in street signs and license plates.

Also, from the visual color point of view, the most striking color collocation is white characters on a blue background and black characters on a yellow background. Blue and white are not very bright. White and yellow have higher brightness. Blue symbolizes rigor. Therefore, it is most suitable for public security departments.

Extended data:

The circular is widely used by party and government organs and units at all levels. Its function is to praise good deeds, criticize mistakes and bad styles, report vicious accidents that should be taken as a warning, and convey important information and matters that all units need to know. Announcement is the language often used by organs, enterprises, institutions and organizations at all levels. Its purpose is to exchange experiences, learn lessons, educate cadres and workers and promote the further development of the work.

The scope of announcement is usually used in an institution or system. Although the circular has the intention of "opening information and widely reporting", the scope of publication is limited to this organ or this system.

People's Daily Online-Why do police reports have to be in white on a blue background? The policeman's uncle's answer lit up