At present, spot color ink color matching method of offset printing spot color ink matching technology research experience summary, the traditional spot color ink matching method based on, in modern offset printing spot color ink application has been more and more widely, the following application of spot color ink do discussion. 

There are several major types of color ink. 

(1) ordinary color ink, used to express color diversity. 

(2) fluorescent color ink, the bright colors in the cover of the journal can be widely used for packaging and. 

(3) metal color ink, the expression for metallic color. 

(4) pearlescent color ink, reflected light scattering effect of pearl, can greatly enhance the added value of products. 

(5) for professional anti-counterfeit color ink, anti-counterfeit printing and special printing. 

(6) other color ink, color ink such as UV etc.. 

Each kind of color at the time of printing is corresponding to a color version and specialized, although on the computer can not accurately said the color, but through standard color matching system of pre color sample cards or manuscript, can see the color on the paper and the exact expression of the. 

Using spot color ink printing has the following characteristics. 

(1) accuracy. Each spot color ink has its own fixed hue, so can ensure the accuracy of color printing, thereby guaranteeing the accuracy of color transfer in a large extent. 

(2) on the ground. No matter how shallow color, spot color color with color definition. Of course, can also give e-plus network, to render any spot color shades. 

(3) opacity. The cover is a color ink nature of the ink, is opaque, so can spot coverage. 

(4) the wide color gamut. The color gamut color color database is very wide, more than the RGB color space, not to mention the CMYK color space, a large part of the spot color CMYK four-color printing ink simply can not occur. 

Residual ink processing of spot color ink: 

For a short version field printing treated with residual ink of spot color ink, at present many manufacturers are will be the place for a long time, so that a crust dust and even oxidative deterioration until scrapped. In fact, we may wish to take the following two ways to deal with. 

One is in the deployment of another batch of dark field spot color ink, according to the difference of its composition and hue, and the original color more than ink mixed with synthetic, but can not change the transfer printing ink hue. 

The second is the long-term storage of various residual ink (commonly known as mixed ink) in accordance with the ink pigment colors coloring principle, the mixing into a "black ink. If the density is not enough, may be appropriate to add colors of black ink. In this way out of the "black" ink, can be used for books and periodicals printing and general peer paper color printing. As is known to all, in four-color printing, black edition only on the pattern in the darkened parts of "Outline" of "emphasis" skeleton, does not affect to the pattern of basic colors. But because of the "ink" cushioned more complex, the printing process will bring spots to field strip parts, and "ink" Mopiduo, printing process in will bring spots to field strip parts, and "ink" blackness Co., will make the field compartmentalization part presents grey phase, and so cannot be used to pattern of black printing field compartmentalization.