Spot ink is interpreted in detail

(a) Spot ink
spot ink refers to a pre-mixed good specific color ink, such as fluorescent yellow, pearl blue, metal gold and silver ink, etc. , it is not by CMYK four colors mixed out, color means accurate color.
it has four characteristics:
1. Accuracy.
each color has its own fixed color, so it can guarantee the accuracy of the color in printing, thus solving the problem of color transmission accuracy to a
; 2. On-the-ground
china'
.
colors are generally defined in field colors, no matter how light they are. Of course, you can also net spot colors (Tints) to
shades of spot colors;
spot-color ink is a kind of covering nature ink, it is opaque, can be covered on
; 4. Express the color field width.
color range in the color library is very wide, more than RGB's performance color range, let alone CMYK color space, so a large part of the color is with CMYK four-color printing ink can not be rendered.
(ii) the special color inkIn order to improve the design and quality level of packaging and decoration products, printing plants in the printing of tobacco, wine, chemical products, pharmaceuticals, daily necessities, such as trademarks, packaging, promotional materials, often use spot ink, to ensure the color consistency of the print, to meet customer requirements.
color ink generally refers to ink manufacturers produced a series of varieties other than a variety of color no ink. In order to be skilled and accurate in the deployment of special angle ink, we must master a certain knowledge of ink colorology.
ink coloring base
1, basic color ink basic color ink according to the mixing method is divided into three categories: primary ink, standard intercolor ink and standard complex ink.
color ink: refers to can not be mixed by other colors out of the three primary color ink, such as yellow, mammoth, cyan ink. Ink three primary colors in theory, according to different proportions and ways of mixing, can be provisioned a variety of different colors, but in practice, no matter how to match can not be matched with pure ink color. Therefore, in color printing, most of the use of yellow, lich, green, black four-color ink to overprint ink.
in addition, different countries and manufacturers produce four-color ink standards are not the same, such as China's offset light fast dry four-color ink color designated as medium yellow, magenta, sky blue and black.
standard intercolor ink: refers to any two primary color equivalent mix formed by the color ink.
standard complex ink: refers to any two intercolor equivalent blends or three primary colors mixed in different proportions to form a color ink, as shown in Table 1.
2, dark spot inkUse one and several primary inks, without any dilution agent for color spelling collectively known as dark spot ink conditioning. According to the principle of color subtract, the number of primary color inks should be used as little as possible when conditioning dark inks. Failure to do so reduces the brightness and color of the ink. However, some products have special requirements for ink color, such as dark brown ink generally with red ink, yellow ink plus a small amount of black ink deployment. In addition, with different proportions of the three primary colors mixed bronze, red purple, dare blue and other shades of complex color, must be used to correct its color cast, such as the green phase is too heavy, can add a small amount of red ink to correct; Just as in the production of offset black ink, the use of light blue, sun-resistant red, indistinct blue and other pigments to adjust the principle of black ink color. Light blue is commonly used in spot color ink, it can eliminate the original brown background in black ink, so that black ink deeper and thicker.
3, light spot color ink  Where you need to add a talkant or white ink for ink tone matching collectively known as light ink deployment. The deployment of light spot ink can not be used in the primary color ink to add a dilution method, because the primary color ink in the punching agent color ability is strong, and the color coloring force of the original color ink is not the same, easy to cause the color is not correct and waste the original ink. The correct method of deployment is to gradually add the primary color ink in the dilution agent, after the color phase meets the requirements, and then expand the proportion of the amount of ink required for deployment.
light-colored ink can be divided into three types:
1) to talk about the main dilute ink: it has a certain degree of transparency, suitable for ink multi-color overprinting.
2) white ink-based anti-light ink: with a strong cover, ink color is more vivid. General synthetic paper with light ink are made of white ink.
3) with a blend of light ink mixed with white ink
spot ink blending method
1, proportional method
ink color blending, first of all, carefully observe, analyze ink samples or printing. Ink sample, can be a scraping sample on Dowling paper, can also be printed with IGT printing suitability instrument, the general four-segment roll ink volume of 0.1m, two-segment roller ink volume of 0.15ml. First of all, to observe and analyze the printing sample may be composed of several colors of ink, can be used with a scale of copper ink straw, proportionally coarse. Look at the thick ink print (scratch) and standard sample is not close, and record the ink ratio and ink volume. If close, convert the scale to a percentage, and then fine-tune with the analytical balance, and if not close, you should change the color ink ratio to continue provisioning.
2, the reduction method
has determined the standard sample (the standard color sample provided by the customer or not close to the standard ink sample) by which several colors of ink composition, find out the ink contained, with the name of 10g or 5g of sulfuric acid paper placed on the glass plate, any adjustment of the ink used, when the ink is close to the standard sample, can be used a few ink sample scraping, observation of the face, background, scraping ink to be recovered. If you are close to the standard sample, the remaining ink can be adjusted to calculate the percentage content of the spot ink. Then use the balance fine tuning, if the near standard sample, continue to provision.
3, PANTONE color matching method
"PANNTONEFormula Guide" 2000 version of the Pantome color matching guide contains 1114 Pantome spot colors, is the world's common color guide, it provides each color standard, with numbering and ink ratio, fan binding, color selection is fast and convenient. For The Putome spot color ink, to carefully observe, analyze the printing sample, and The color sample of the Putome company color matching guide, find out the close color sample, if very close to note the color sequence number and corresponding to compare the TCT ink color matching guide printing, analysis of the printing of the two color matching guide, is consistent; After analysis, you can adjust the proportion of ink used in the printing sample. This makes provisioning relatively easy.