What color is the five-color paper?

Five-color paper is red, yellow, blue, black and purple.

1, red

Red is the color at the end of low frequency in the visible spectrum of electromagnetic waves, and its frequency range is 380 ~ 480 Hz, corresponding to the wavelength of 780 ~ 620 nm in the air. Red is one of the three primary colors and four psychological colors of light, which is similar to the color of fresh blood. Red represents auspiciousness, jubilation, enthusiasm, happiness, boldness, courage, fighting spirit, revolution, exuberance and passion.

2. yellow

Yellow is the intermediate frequency part of the visible part of electromagnetic wave, the frequency is 505~525THz, which is similar to the color of ripe lemon or sunflower chrysanthemum, and the spectrum is between orange and green. Yellow gives people a feeling of happiness, hope and vitality.

Yellow is one of the four psychological primary colors and one of the three primary colors. Yellow is a superposition of red light and green light. The mixture of red light and green light can produce yellow light, and the red plus green in the pigment is brownish black. The optical complementary color of yellow is blue, but traditionally, painters use purple as the complementary color of yellow.

3. Blue

Blue is one of the three primary colors and four psychological colors of light, representing the color of the sky. Because air molecules and dust in the air scatter sunlight in Rayleigh way (the scattering intensity is proportional to the fourth power of frequency), they scatter more high-frequency light (green, blue and purple light) than low-frequency light (red, orange and yellow light), so the clear sky is blue. Because seawater absorbs more low-frequency light (red, orange and yellow) than high-frequency light (green, blue and purple), seawater will appear blue.

4. Black

Black is defined as basically no visible light entering the visible range. Contrary to white, it means that all the light in the visible spectrum enters the visible range at the same time.

If the pigment absorbs all visible light in the spectrum and does not reflect any color light, the human eye will feel black. If the pigments of the three primary colors are mixed in a proper proportion, and the reflected colored light is minimized, the human eye will also feel black. So black can be caused by insufficient light (night) or by absorbing all colors of light (black pupil).

5. Purple

Purple refers to a color in daily life. Purple is a secondary color, which belongs to an absolute neutral color. It is a combination of warm red and cool blue, and it is an excellent exciting color.