Color Function-Blue

In the visible spectrum, the wavelength of blue light is shorter than that of green light, and is slightly longer than purple light, the refraction angle formed when penetrating air is large, and the linear distance of radiation in air is short. Every morning and evening, the sun's rays must travel through the atmosphere three times times thicker than noon to reach the ground, in which Lanzi has already refracted, to reach the ground is only red and yellow light. So the sun that can be seen in the morning and evening is red and yellow, only in the mountains, far mountains, near the horizon, is blue. It is the most shallow image on the retina. If the red Orange is considered to be the forward color, then the blue should be the far fading back.
Where the blue is, it is often a place that human beings know little about, such as the word universe and the deep sea. The ancient people thought that it was the God Monster's residence, it is mysterious and unpredictable. Modern people take it as an area of scientific exploration. So blue becomes the symbolic color of modern science. It gives people the power of calmness, contemplation, wisdom and conquest of nature.
In modern decoration design, blue and white can not cause appetite but can only indicate cold, become a symbol of frozen food color. If it serves as a foil color for appetite, the effect is quite good.