Although the sky has various shades, it is mainly associated with the color blue.
Blue is the color that, in the light spectrum, is in fifth place. It is a tone similar to that of the sea or the sky when there are no clouds.
a primary color
Since it cannot be generated by mixing other colors, blue is part of the group of primary or primitive colors. According to color theory , meanwhile, it is a cold color due to the effect it produces on people.
When we talk about primary colors, we must distinguish between additive and subtractive colors. The first belong to light, and are red, green and blue . Subtractives, on the other hand, are pigments, that is, they are used for painting, and they are red, blue and yellow . In both cases, the combination of each group allows us to obtain the rest of the colors, with two exceptions: in light, the three at their maximum form white, while at zero they give black; In painting, the three in equal proportions generate black, but white is obtained without any of them.
Uses of the color blue
Many flags use blue, either in the background or in other sectors. New Zealand , Israel , the United States , Australia , France and Chile are some countries whose national flags feature blue.
It is common for blue to be used in the Police uniform . In the colloquial language of some regions, thus, a blue is an agent of this security force. For example: “Watch out, here are the blue ones coming!” , “A blue guy asked me for my documents while I was walking in the park” , “Once the alarm goes off, we have five minutes to act before the blues arrive” .
blue blood
The expression “blue blood” , on the other hand, is used to refer to those who belong to royalty or aristocracy . The phrase arose in ancient times and is associated with the fact that individuals from these social classes did not have the need to work in the fields, so their skin used to be pale and, thus, it was possible to see their veins easily. Since the veins look blue, people began to talk about “blue blood.”
This expression is not used very frequently in everyday speech, where there are other more vulgar ones that are better suited to informal language. Furthermore, even when we do use it, we do not always do so to talk about a member of royalty , but rather we often want to refer to the social status of their family or simply their material wealth.
Blue screen
In the field of computing , finally, we find the blue screen of death , also simply called blue screen or blue screen . This is seen when Windows , the operating system developed by Microsoft , fails to recover from a failure.
The blue screen shows an error that the system cannot resolve
Although the blue screen is frequently associated with this operating system , it is worth mentioning that it also appears in others, since the choice of the blue color is not an aesthetic issue that differentiates Windows from the others, but is partly reminiscent of old times, when that the monitors could display a few shades, and it is also a good way to alert the user without resorting to the color red, which would be very harmful to their eyes in such a surprising situation.
Microsoft has been the subject of ridicule on more than one occasion due to the unexpected appearance of the blue screen in various presentations of Windows versions, but also in events focused on its video game console, the Xbox. In short, when a technical problem occurs that the system does not know how to correct , it presents the user with a white message on a blue background with technical data that, in some cases, could help them investigate the origin and find a solution.