Basic knowledge of printing color in the process of blending. In the packaging printing ink system, the binder is colorless or slightly colored liquid, and the refractive index is very close to water, so the binder has a certain degree of transparency. When the pigments and fillers are added, the pigments and / or materials block the radiation of light, resulting in the change of the optical properties of the ink.

When sunlight into the yellow color printing ink film, it means that it absorbs the blue spectrum of sunlight and emits yellow and green light. When the yellow light and green light reflected by Shenyang printing meet the blue pigment particles, the reflected blue light will be absorbed and only the green light will be left. After a series of reflection and refraction, it only reflects the green ink film. Therefore, we call this kind of printing ink color mixing is subtractive mixing (absorbing each other's required wavelengths without being reflected by the absorption spectrum), which is the origin of mixed color (or multicolor).

In China's packaging printing ink industry due to the use of subtraction principle, so the use of three primary color complementary color.

We use a variety of printing ink color light to compound a lot of colorful ink color.

If the color of packaging and printing decoration design is fully conceived, from the three primary colors of yellow, magenta and green to the three intermediate colors of red, green, blue, and then to four colors of purple, bronze, olive green, black, it can be combined into a new form of expression, just as people have known, if different ink color tone (hue), different ink lightness and different ink color Color combination and deployment together, will also give people a kind of soft and harmonious feeling of beauty.

Throughout the domestic and foreign packaging printing ink color card, except for the three primary colors, most of them are composite colors. The blending of compound colors is a color science. The color of packaging and printing prepared by our visual inspection is good, bad and good. The use of packaging and printing decoration color to give us the goods we need, decorate a wide range of colors, constantly adjust the working and living environment, will give people benign stimulation, is conducive to the improvement of the quality of work and life.

Several colors coexist in the same environment of commodity packaging decoration, so the coordination between colors is always an endless topic for us to study. For example, complementary (red and green) colors (the sum of the two colors equals white), sometimes it will give people a vulgar feeling if it is not well matched. If it is well mixed, it will give people a strong and eye-catching feeling. Light yellow with reddish brown, because the color between yellow and red is close, the tone is similar to give people a harmonious beauty. There are dark green and light green to match, the color is fresh and dazzling. With the method of achromatic and color matching at the same time, it gives people a bright feeling and protects their eyesight. Red, white and blue appear on one package at the same time, which gives people the feeling that red is warm, white is pure and blue is solemn, which reflects the beauty of a commodity.