Through long-term life experience, people have consciously or unconsciously formed the ability to judge and feel objects based on colors. Different colors give people different visual and psychological feelings. It not only enhances consumers' aesthetic pleasure, but also stimulates consumers' judgment and confidence in purchasing, enriches their imagination, and cultivates the minds of customers. It really makes us feel the value and power of packaging design colors. As we all know, people's sight relies on the role of light to observe the beginning and color of the object and recognize the objective existence. If there is no light, human visual activity will disappear, and of course there will be no color. Different objects have different light absorption and reflectivity. Therefore, different colors are produced. Among all objects, black objects can absorb seven colors of light, while white objects reflect all seven colors. For this reason, black and white lose their color appearance compared with other colors, and form their own unique achromatic properties.
