With the popularization of each anti-counterfeiting technology, the possibility of counterfeiting will increase, and the anti-counterfeiting function will gradually decrease. Therefore, extending the timeliness and uniqueness of anti-counterfeiting technology has always been the goal pursued by anti-counterfeiting technology. The same color heterogeneous ink is a new type of ink with unique anti-counterfeiting function.
Metamerism: We know that each object has its fixed optical properties. Under the sunlight, the color is fixed, and the inherent spectral parameters of the substance are certain, it will not change with the changes of external conditions . Therefore, the spectral data is the only true description of the color of the object.
In the evaluation and description of color systems, three-dimensional coordinate systems are often used to express the characteristics of colors. Namely, color is described by three basic parameters: hue, lightness, and saturation. In addition, the reproduction of one color has a certain relationship with the characteristics of the light source observing the color. Some two substances show the same color under one light source, but they show different colors under another light source. This phenomenon It is called metamerism. In order to conduct standard evaluation of this phenomenon, the International Lighting Commission has launched a metamerism evaluation index for evaluating the phenomenon of color tube metamerism.
Metamerism inks: Metamerism inks are developed based on the principle of metamerism of substances. Under the irradiation of sunlight, the two metamerism inks have the same color visual effect, that is, they have the same color characteristic expression value, but the spectral properties of the two inks are different. The same color heterogeneous ink is the use of two pigments with the same color and different spectral characteristics to produce two inks with the same color effect and different spectral characteristics, becoming a pair of same color heterogeneous ink. The anti-counterfeiting function of the same color heterogeneous ink mainly depends on the different absorption and reflection ability of the pigment in the ink that plays a role in color development.
The anti-counterfeiting effect of the same color heterogeneous ink is obvious and easy to observe; due to the need to use a special pigment series to produce, its anti-counterfeiting security is good; the same color heterogeneous ink has good durability and stable performance, unlike fluorescent inks that have decay cycle After a certain period of time, the color rendering characteristics will not change.
There are two methods for observing and discriminating the same color heterogeneous ink suitable for anti-counterfeiting ink. One method is that, according to a pair of metamerism inks having different spectral characteristics, that is, different spectral characteristics, the spectra of these two inks can be measured by instruments to compare and distinguish. The second method is simple and easy. It is based on the principle that the ink has selective absorption and reflection of light, and a pair of inks is passed through a specific color filter. One of the inks changes the reflected light due to the color filter. At the same time, after this ink passes through the color filter, it still absorbs and reflects the original light, and the displayed color has not changed. In this way, we can distinguish the true and false of the target object through two fixed, different colors.
application
The use of the same color heterogeneous ink is mostly offset printing, which can be used for color printing or normal printing. The two inks should be printed on the adjacent parts of the substrate for easy observation and comparison. Moreover, the same color heterogeneous ink can be combined with infrared ink to achieve better anti-counterfeiting effect. The characteristic of combined anti-counterfeiting is that under the illumination of the spectral wavelength of 600-1000mm, the visual effects of the two are the same, one ink is colored under infrared irradiation, and one ink absorbs infrared light and shows a colorless state, and the spectral characteristics of both Similarly, this can achieve double anti-counterfeiting effect.
In foreign countries, the same color heterogeneous ink has been used for printing money. At present, there is no practical application in China. It needs to be further understood and play its anti-counterfeiting role.
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