Red, orange and yellow are warm colors, symbolizing: the sun and flame, so they are called warm colors; Green, blue and purple are cool colors, symbolizing forest, sea and blue sky, so they are called cool colors; Gray, black and white are intermediate colors. In addition, the higher the brightness of the cool tone, the warmer it is, and the lower the brightness of the warm tone, the colder it is.
Yellow is the intermediate frequency part of the visible part of electromagnetic wave, with the frequency of 505~525THz (corresponding to the wavelength of 595~570nm in the air), which is similar to the chrysanthemum color of ripe lemon or sunflower, and its spectrum is between orange and green. Yellow gives people a feeling of happiness, hope and vitality. According to the color, it gives people different feelings such as cold and warm. Color is divided into cool color, warm color and neutral color. Cool color refers to the color that gives people a cold or cold feeling. Warm color refers to the color that gives people a warm or fiery feeling. Neutral color, also known as achromatic color, consists of three colors: black, white and gray. Neutral colors often play the role of spacing and reconciliation in color libraries and are widely used in exhibitions. Being good at using neutral colors will get twice the result with half the effort for fashion exhibitions.