1. Optically, in the visible spectrum, the wavelength of blue light is shorter than green light, but slightly longer than violet light. When it penetrates the air, it forms a large refraction angle, and the linear distance radiated in the air is short. Every morning and evening, the sun's rays must pass through the atmosphere three times thicker than noon to reach the ground. Among them, blue-violet light has been refracted, and only red and yellow light can reach the ground. Therefore, the sun you can see in the morning and evening is red and yellow, and only the near mountains, distant mountains and underground lines are blue. It has the shallowest imaging position on the retina. If red and orange are regarded as progressive colors, then blue should be a fading color.

The place where blue is located is often a place that human beings know little about, such as the universe and the deep sea. Ancient people thought it was the residence of gods and monsters, which made people feel mysterious. Modern people regard it as a field of scientific discussion. Therefore, blue has become a symbol of modern science. It gives people calmness, meditation, wisdom and the power to conquer nature.

2. In chromatography, blue is a cool color, but it is also a cyan and magenta color, which adds a bit of emotional emotion to calmness.

Let's analyze blue:

Sky blue: the lightest blue, with almost no trace of red, looks very cold in the sky. It represents the original color, and it is the representative of the biological childhood (the mature color is green). Psychologically speaking, sky blue, like pink, is a "soothing color" and a quiet and relaxed color.

Lake blue: dark blue, but with bright light, beautiful like a lake immersed in endless silence. The representative means to wait. In the hint of color, it is the color of forbidden words. Usually in places full of this color, people talk less.

Sapphire blue: Legend has it that the prototype of the goddess of hope is a blue diamond. Therefore, the jewel-like beautiful blue has become synonymous with hope. Psychologically speaking, sapphire blue, like purple, will give people a noble feeling and attract people's attention.

Kong Quelan: It is the most mysterious blue. Almost no one can be sure where its correct color value is. This is a vague color. Different people will have different interpretations of it, which means hiding. In the field of printing, this color will have a great error with imagination. In the spiritual field, this color is unattainable in the sacred world, and it is a special color besides gold and silver.

Blue: True blue, like its English name, is synonymous with melancholy. Cyan and red, which divide the blue series equally, perfectly unify the values here, showing a purplish deep blue in the night sky. Psychologically, dark blue will give some people who are easy to accept hints a sense of oppression, but some optimistic people will feel relaxed.

Violet: This is the color of blueberries. People who like berries will associate this color with the sweet and sour taste of small blueberries in the shade of the forest. This color has the same meaning as blueberry: mysterious. In the field of beauty, this color will give people a sense of quiet temptation, but in general use, it will give people a sense of pride, because the color is too inflated.