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 transparency. When the pigment and filler are added, because the pigment and filler block the light, the optical properties of the ink change. Today, the editor of China Paper Network will introduce the relevant content in detail from the perspective of color blending.

When sunlight hits the yellow color printing ink film, it means that it absorbs the blue spectrum in sunlight and emits yellow and green light. When the reflected yellow light and green light meet the blue pigment particles again, they will often absorb the reflected blue light, leaving only the green light. Therefore, after a series of reflection and refraction, only green ink ink film is reflected. Therefore, we call the color mixing of this printing ink color subtractive mixing (mutual absorption of their required wavelengths, but not 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 the subtraction principle, so the use of three primary colors complement.

We use the color light of various printing ink colors to match many colorful ink colors.

If the colors of packaging, printing and decoration design are fully conceived, from the three primary colors of yellow, magenta and cyan to the three intermediate colors of red, green and blue, and then to the four multicoloured purplish red, bronze, olive green and black, they can be combined into a new form of expression, just as people have known that if different ink color tones (hue), different ink lightness and different ink color chroma are combined together, It also gives people a soft and harmonious feeling of beauty.

Looking at the colors selected for the color cards of packaging printing ink at home and abroad, except for the three primary colors, most of them are composite colors. The deployment of composite (composite) colors is a color science in itself. The packaging printing colors prepared are finally checked by our visual inspection to determine their effects, good, bad and good. Using the decoration color of packaging and printing to give us the goods we need, decorate a dazzling array of colors, constantly adjust the working and living environment, will give people a benign stimulus, and help improve the quality of work and life.

There are several colors in commodity packaging and decoration in the same environment, so the coordination between colors is always an endless topic for us to study. For example, the complementary (red and green) colors (the two colors add up to white) sometimes give people a vulgar feeling if they don't match well. If they are well mixed, they will give people a strong and eye-catching feeling. Light yellow with reddish brown will give a harmonious beauty due to the close color between yellow and red. There are also dark green and light green, which are fresh and dazzling. Use the method of matching achromatic and color at the same time to give people a bright feeling and protect their eyesight. Red, white and blue appear on the same package at the same time, giving people the impression that red is warm, white is pure, and blue is solemn, reflecting the beauty of a commodity.

Although China has formulated the Chinese color chromatography as early as the 1950s, and more than 4000 varieties in 56 enterprises have been summarized into 86 printing inks of five types, including P, T, A, W, Z, which are now unified, and 29 detection standards have been formulated successively. In addition, the printing ink color cards of various packaging printing ink factories are publicized and distributed in various packaging printing enterprises. As a packaging printing and printing ink designer and worker, we should not be limited to the existing range of ink color cards and hue. We can often use the Munsell color map to combine the Chinese color system physical sample book with the computer color matching to gradually meet the purpose of the increasingly different requirements of users