Spot color ink (on)

In order to improve the design and quality of packaging and decorating products, printing companies often use spot-color inks when printing labels, packaging, and promotional materials such as cigarettes, wine, chemical products, pharmaceuticals, and daily necessities to ensure that the colors of printed products are consistent. Sex to meet customer requirements.
Spot color inks generally refer to inks of various colors produced by ink manufacturers. In order to skillfully and accurately deploy special corner inks, it is necessary to master certain ink chromatics knowledge.
1 Ink tinting basic 1, basic color ink The basic color ink is divided into three categories according to different mixing methods: primary color ink, standard color ink, and standard multi-color ink.
Primary color ink: refers to three primary color inks that cannot be mixed by other colors, such as yellow, magenta, and cyan inks. The three primary colors of ink theoretically speaking, mixed according to different proportions and methods, you can deploy a variety of different colors, but in practice, no matter how the mix can not match with pure ink. Therefore, in color printing, yellow, magenta, cyan, and black four-color inks are mostly used to overprint inks.
Table 1 basic color ink mixing ratio

Ink hue mixing ratio (%)
Yellow (Y) Magenta (M) Blue (C)
Original Yellow (Y) 100 - -
Magenta (M) - 100 -
Blue (C) - - 100
Color Red 50 50 -
Green 50 - 50
Blue Purple - 50 50
Duplex red purple 25 50 25
Bronze 50 25 25
Olive 25 25 50
Black 33.3 33.3 33.3

In addition, different countries and manufacturers of four-color ink standards are not the same, such as our country's offset bright and dry four-color ink color is designated as yellow, magenta, sky blue and black.
Standard color ink: refers to the color ink formed by the equal mixing of any two primary colors.
Standard multi-color ink: refers to any two color inks mixed in equal amounts or three primary colors mixed in different proportions, as shown in Table 1.
2, dark spot color ink deployment with a variety of primary colors and ink, without any diluting agent for spelling collectively referred to as a dark spot color ink deployment. According to the principle of subtractive color, the number of primary color inks should be minimized when deploying dark ink. Otherwise it will reduce the brightness and color of the ink. However, some products have special requirements for ink color. For example, dark brown ink is usually formulated with red ink, yellow ink, and a small amount of black ink. In addition, with different proportions of the three primary colors mixed bronze, red purple, dazzling green and other complex colors, we must use complementary theory to correct the color cast, such as the green phase is too heavy, you can add a small amount of red ink to correct; Red phase is too heavy, can add a small amount of blue ink to correct; purple too heavy, can add a small amount of yellow ink to correct; if you want to deepen the black ink concentration, you can add a small amount of dark red, blue light to adjust. Just as in the production of offset black ink, the principle of adjusting black ink hue is the same with light blue, fast red, and blue. Spot blue is commonly used in spot color inks, it can eliminate the original brown bottom in black ink and make black ink darker and thicker.
3, the deployment of light-colored spot color ink where the need to join the chatter or white ink ink color matching system called light-colored ink deployment. The deployment of light-colored spot color inks can not be used in the method of adding a diluting agent in the primary color ink, because the primary color ink has a stronger color rendering ability in the colloidal agent, and each primary color ink has a different coloring power, which easily causes inaccurate hue and waste of the original ink. . The correct deployment method is to gradually add the primary color ink in the diluting agent, and after the hues reach the requirements, the ink volume required for the proportion deployment is enlarged.
Light ink can be divided into three types:
1) Dye-type ink mainly based on blister agent: It has a certain degree of transparency and is suitable for multi-color overprint of ink.
2) Extinction type ink based on white ink: It has strong hiding power and bright ink. The general synthetic paper used light-colored inks are tuned with white ink.
3) Light-colored ink formulated with diluting agent and white ink. (To be continued)

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