What is the material impression of color?

The material impression of color is generally produced by two color systems: cold and warm. Cold and warm colors are people's physical classification of colors according to psychological illusions. Generally speaking, red light, orange light and yellow light have longer wavelengths and have a warm feeling. Illuminating any object with such light will increase the sense of warmth. In winter, when we turn off the fluorescent lamp and turn on the incandescent lamp in the house, we will feel warm. On the contrary, violet light, blue light and green light have a cold feeling. If we turn off the incandescent lamp indoors and turn on the fluorescent lamp indoors in summer, it will also increase the feeling of coolness. The same is true of the packaging of goods. If you use cool colors on the packaging of cold drinks or cold foods, it will undoubtedly create a sense of yearning for these foods visually.