Everything is expressed by three characteristics of color, chromaticity and contrast, so the three elements must be considered in the whole process of color. Although the basic theory says that gray-black is the complete digestion and absorption of the light source, the black ink still has gloss.

The printing ink is made by mixing the color paste (pigment) and the epoxy resin. The object of the color paste is surrounded by a layer of almost completely transparent epoxy resin. This layer of epoxy resin is used for the light source. With the effect of refraction angle and reflective surface, people can feel that the black ink package printing still has the necessary gloss on the board. In the whole process of printing ink color, it is necessary to decide the common printing ink according to the actual printing technology, thin ink layer, packaging and printing plate. When selecting printing inks, the gloss, color, color, and paint adhesion of the printing ink should be considered.

1. Gloss can be accurately measured by instrument and equipment, and can be distinguished by the naked eye. Generally, it is only observed by the naked eye in the whole process of color. Gloss is actually the level of the working ability of the ink print sample to the same azimuth to reflect the surface light source after being directly exposed to light. It immediately jeopardizes the appearance of promotional materials and is a very important indicator value. Together, when selecting printing inks, it is necessary to distinguish whether the printing ink itself is a bright, semi-light or matt printing ink to prevent incorrect mixing.

2. Color is the essential feature of color, used for qualitative differences. When color, the first thing to consider is whether the color is the same. The inspection method is generally based on the scratching of the scraping paper or the simulation of the package printing, and the inspection of the standard sample and the test piece by eye.

3. Paint adhesion is the level at which the printing ink covers its background color. The higher the adhesion of the paint, the worse the clarity, and the high definition is harmful to the high efficiency of printing ink color and the level of damage caused by the printed printed board.

11. The coloring power is a way of expressing the high density of the printing ink. The measurement should be carried out with a sufficient amount of printing ink and then add the required total number of white printing inks, and then carry out the comparison with the standard. The difference in color strength reflects the level of the mixed color of the ink, which jeopardizes the thickness of the printed printing ink film.

According to the color tone, the coloring paper is used for the Drowdown test, which can compare the difference between the ink test piece and the standard sample in terms of glossiness, color, and paint adhesion. Specific practice: put the standard printing ink on the upper left side of the evaluation paper, and put the color printing ink on the upper right side, about 1 cm from each other, and use the squeegee to flatten and apply a thin portion of the angle of view with the vertical color of the scraped color paper. Lightly and gently flatten a part of the thick layer with a skewed viewing angle.

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