JPH09267592A - Ink and printed matter for preventing forgery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discriminate easily the forgery utilizing a copier of high resolution by setting the component ratio of a coloring material and a pearl pigment contained in ink in the specified range. SOLUTION: The component ratio of a pearl pigment coating a metal oxide which is transparent in a visible zone provided with refraction properties of 2.0 or more as the metal oxide providing reflection properties to a coloring material of a yellow component as the brightest color separation component contained in ink and mica is set in the range of 1:0.1 to 1:99. When a background section 3a and a latent image section 2a are printed by using ink having set the above-referred range, a copied matter 4a in which the latent image section 2a is decolored and the background section 3a is color changed is formed by copying by a color copier. Forgery utilizing the color copier of high resolution can be discriminated easily by the arrangement to prevent the forgery by the color copier.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink capable of preventing copy forgery by a color copying machine and a printed matter printed using this ink.

[0002]

2. Description of the Related Art In recent years, with the development of color copying machines, it has become possible to make fine copying which is difficult to distinguish from the real one, and forgery of securities, checks, bills, etc. by copying has occurred. These copied / counterfeit printed materials can be easily identified as counterfeit by an expert appraiser, but securities and the like are many types and widely distributed, and there are many opportunities for the general public to handle them. for that reason,
It is impossible to rely only on a skilled person to determine the authenticity of all securities and the like, and it is desirable that the general public can also easily make a determination. As a method for facilitating the determination of the authenticity of such securities, a technique that utilizes the difference between the human specific visual sensitivity and the spectral sensitivity of the special colorant and the resolution of the human visual acuity are conventionally known. There is a technology that utilizes the difference in the resolution of the copier. An example of a printed matter on which anti-counterfeiting measures are made by utilizing the difference between the human visual acuity and the spectral sensitivity of the special color material is described in Japanese Patent Application Publication No. 55062 of 1988.
Further, examples of printed matter for which forgery prevention measures are made by utilizing the difference between the resolution of human eyesight and the resolution of a copying machine are published in Utility Model Application Publication No. 15338 of 1991 and Utility Model Application Publication No. 14220 of 1992. , 1992 Utility Model Application Publication No. 20547.

[0003]

The conventional technology utilizing the difference between the human visual acuity and the spectral sensitivity of the special color material is forgery prevention utilizing the human visual acuity and the sensitivity of the copying machine. This is a technique, and is characterized in that a desired pattern is formed by using a special colorant having a high spectral reflectance in a region where the human visual acuity is low in order to prevent forgery caused by copying a printed matter. Therefore, the number of color materials applicable to this technology is 45
0 to 650 nm region and 450 nm or less, or 650
Only a limited amount of colorant can be used under the condition that it has a high reflectance of not less than nm. Further, in the conventional technique utilizing the difference between the resolution of the human visual acuity and the resolution of the copying machine, the printing condition becomes stricter as the accuracy of the copying machine is improved, and it becomes difficult to carry out satisfactory implementation.

Therefore, the inventors of the present invention previously developed an anti-counterfeit ink and an anti-counterfeit printed matter using the anti-counterfeit ink (Japanese Patent Application Publication No. 726/1995).
No. 62). The developed anti-counterfeit ink is an ink containing at least an arbitrary colored material (first coloring material) and a coloring material (second coloring material) having a high reflectance of 30% or more in the entire visible light region. The anti-counterfeit printed matter, in which the component ratio of the first color material and the second color material is in the range of 1: 0.1 to 1:99, increases the reflected light amount during copying. Therefore, a specific color separation component of the three primary colors is affected and becomes difficult to be recognized by the photoconductor of the color copying machine, and the color reproduction is not faithfully performed.
Compared with the original printed matter, it becomes a discolored copy, making it easy to identify forgery. However, in order to facilitate the discrimination of forgery, it is desirable that the difference in color tone between the actual printed matter and the copy thereof and the large decoloring effect are large, but if the amount of the second color material is increased for that purpose, On the other hand, the expression of the color tone of the printed matter will be hindered, and on the other hand, the demand for increasing the amount of the second color material and the demand for reducing it may conflict with each other. For these reasons, there is a demand for the development of a technique in which the color tone of the printed matter and the copy thereof are significantly changed and the decolorizing effect can be enhanced.

The present invention has been made in view of the above circumstances, and uses an anti-counterfeit ink and an anti-counterfeit ink which can easily discriminate forgery using a high-resolution copying machine. The purpose is to provide the anti-counterfeit printed matter.

[0006]

To this end, the anti-counterfeit ink of the present invention is an ink containing at least an optional colorant and a pearl pigment, wherein the colorant and the pearl pigment are combined. Component ratio (weight ratio) is 1: 0.1
It is characterized by being in the range from 1 to 99.

Further, in the anti-counterfeit printed matter of the present invention, at least a part of the printed portion is printed with the anti-counterfeit ink in a single color or in a plurality of colors, and the anti-counterfeit ink is composed of at least any colorant and An ink containing a pearl pigment, characterized in that the component ratio (weight ratio) of the colored material to the pearl pigment is in the range of 1: 0.1 to 1:99.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The principle of a color copying machine is to illuminate a printed matter, which is an original, and to separate the reflected light with three kinds of color filters of red (R), green (G) and blue (B). Then
Extraction of the three primary color components of cyan (C), magenta (M), and yellow (Y), and the addition of each color toner corresponding to these three primary color components, in some cases black (B1), to reproduce the color mixture of four color toners Is what is done.

In these color copying machines, the present inventors increased the amount of reflected light of an original at the time of copying, so that a part of a specific color separation component, for example, a yellow (Y) component was a normal color copy. It has been found that it is difficult for the photoconductor of the machine to recognize it.

The present invention utilizes this feature,
Specifically, an anti-counterfeit ink is used which comprises a colored colorant (first colorant) used in a known colored ink and a pearl pigment which increases the amount of reflected light at the time of copying.
A printed matter printed with this anti-counterfeit ink has a greater amount of reflected light during copying than a printed matter printed only with a colored colorant that does not contain a pearl pigment (first colorant). Of the color separation component, for example, the yellow (Y) component, which is the brightest color separation component, is less likely to be recognized by the photoconductor of the color copying machine, and the balance with other cyan (C) and magenta (M) is It will collapse and color reproduction will not be performed faithfully. As a result, compared to the original printed matter, the copy becomes a color tone in which the color tone of the yellow (Y) component has been removed, and forgery can be easily discriminated. In particular, when a printed matter is printed with this anti-counterfeit ink, when a printed image is formed by the density of specific halftone dots or lines, in addition to the above discoloration, a decolorizing effect is added,
Forgery can be identified even more easily. Further, the printed matter itself exhibits the dichroism of the color of the colored coloring material (first coloring material) and the iris color (metallic luster color) by the action of the pearl pigment contained in the anti-counterfeit ink, whereas the copied material Since it does not have the iris color, it is easy to determine whether it is a copy. In addition, by changing the thickness of the metal oxide such as titanium oxide that covers the mica that constitutes the pearl pigment in the anti-counterfeit ink, it is possible to emphasize a specific color of the iris color, so two colors are printed on the printed matter. The characteristics are emphasized, and the difference in color between the printed matter and the copied matter is enlarged, and the determination of the copied matter becomes easier.

[0011]

EXAMPLES The details of the present invention will be described below with reference to examples.

The physical properties and composition of the anti-counterfeit ink used in the present invention are as follows. That is, it is composed of at least a colorant (first colorant) and a pearl pigment. The colored color material constitutes the basic color of the anti-counterfeit ink of the present invention, and can be composed of the following known color materials according to each color. Examples of the yellow pigment include inorganic pigments such as chrome yellow, cadmium yellow and titanium yellow, and generally C.I. such as quinophthalone type, azo type and isoindoline type pigments. I. Examples of the organic pigments belonging to Pigment Yellow and red pigments include inorganic pigments such as cadmium red, red iron oxide and molybdenum red, and generally C.I. such as azo, quinacridone, perylene and lake red. I. Examples of the organic pigments belonging to Pigment Red, and purple pigments include inorganic pigments such as cobalt purple and manganese purple, and generally C.I. such as oxazine-based pigments, azo-based pigments, and anthraquinone-based pigments. I. Examples of organic pigments belonging to Pigment Violet, and blue pigments include inorganic pigments such as ultramarine blue, dark blue (Prussian blue), and cobalt blue; and phthalocyanine-based, slene-based, azo-based, and anthraquinone-based C.I. I. Examples of the organic pigments belonging to Pigment Blue and green pigments include inorganic pigments such as chrome green and cobalt green, and generally C.I.
I. An organic pigment belonging to Pigment Green can be used. Colored coloring materials are based on these known coloring materials as vehicles,
Add additives to make ink. Further, it is also possible to prepare a color material having an arbitrary color tone by combining a plurality of these color materials. In addition, known color inks such as offset inks and gravure inks used in general printing can also be used as the colorant.

The colorant having any color tone can be used, but one containing a yellow (Y) component which is the brightest color separation component is preferable. In general, many colors except for some colors contain a yellow (Y) component when color separation is performed on the three primary colors, and therefore the color tone of the colorant can be selected from a wide range. When such a colorant is used, the yellow (Y) component when the colorant is color-separated changes quantitatively due to the presence of the pearl pigment, and as a result, other cyan (C) and magenta When the balance with the component (M) is lost, a copy that is discolored compared to the original print can be obtained. According to the results of experiments conducted by the inventors, the effect of discoloring the greenish color was particularly remarkable. In addition, it has been experimentally confirmed that when not only the yellow (Y) component but also the cyan (C) and magenta (M) components have an increased reflected light amount, they are similarly affected by discoloration. Therefore, it is possible to select a color material having an arbitrary color tone.

The pearl pigment is used to increase the amount of reflected light at the time of copying. If the pearl pigment has a high reflectance of 30% or more in the entire visible light region, the amount of reflected light required at the time of copying can be obtained. . This pearl pigment is a pearlescent pigment, and is a crystal of carbonate, arsenate or the like, and when light is incident on this pearl pigment, multiple reflection is regularly performed, and pearlescent appears.

The pearl pigment used in the present invention is a metal oxide that imparts reflectivity (high iris reflection) to mica.
A metal oxide that is transparent in the visible range and has a refractive index of 2.0 or more, such as Sb ₂ S ₃ , Fe ₂ O ₃ , Pb.
O, ZnSe, CdS, Bi ₂ O ₃ , TiO ₂ , PbC
l ₂ , CeO ₂ , Ta ₂ O ₅ , ZnS, ZnO, Cd
It is formed by coating a single layer of O, Nd ₂ O ₃ , Sb ₂ O ₃ , SiO and InO ₃ or by coating two layers.

When the mica and the metal oxide film are combined, the difference in the refractive index between them is larger than 0.4, so that the amount of incident white light is reflected at the same time, and at the same time, the sub-side at the interface between the mica and the metal oxide film. Since it causes refraction, it becomes highly iris reflective,
It works to promote the discoloration effect more effectively.

At this time, by controlling the film thickness of the metal oxide film that coats the mica, the film thickness that can be made into a pearl pigment having a high rainbow reflectivity of any color tone is 10 to 10000 angstrom, preferably 200. A film thickness in the range of up to 2000 angstroms is desirable because it provides high iris reflection in the visible range.

A commercially available product of such a pearl pigment is "Iriodin" (trade name, manufactured by MERCK). "Iriodin" is a stable inorganic pearl pigment in which the surface of natural mica is coated with high-refractive-index metal oxides such as titanium oxide and iron oxide. It is a layer of titanium oxide with a high refractive index and mica with a low refractive index and its surroundings. The light reflected at the boundary with the medium causes the pearl luster. This "I
By changing the film thickness of titanium oxide coated on the riodin, a particular color of the iris color can be emphasized. Such a pearl pigment is used as an ink by adding a vehicle and additives to a mixture with a colorant. This is the anti-counterfeit ink of the present invention.

The content of the pearl pigment in the anti-counterfeit ink is preferably 1% by weight or more. If it is 1% or more, a sufficient amount of reflected light can be obtained during copying. The component ratio (weight ratio) of the colored color material and the pearl pigment is 1: 0.1.
To 1:99, particularly 1: 9 to 1: 4 for gravure ink and 1: for offset ink.
It is preferably 1 to 1:20. If the pearl pigment is smaller than 0.1, a sufficient amount of reflected light cannot be obtained, so that the change in color tone during copying is small and it is difficult to visually recognize the change. On the other hand, when the pearl pigment is larger than 99, the amount of reflected light is too large, so that it becomes difficult to express a desired color tone on the printed matter itself and the print quality is deteriorated. The anti-counterfeit ink can be made by adding the colorant and pearl pigment in the above-mentioned component ratio (weight ratio), but if necessary, polyvinyl chloride resin, polyvinylidene chloride resin, polyvinyl acetate resin, polyolefin resin Alternatively, it may be prepared by dissolving a colorant and a pearl pigment in the above-mentioned component ratio (weight ratio) to a synthetic resin as a vehicle such as a polystyrene resin or the like, and dissolving it in an organic solvent.

The printing method using the anti-counterfeit ink may be a known printing method such as a gravure printing method and an offset printing method. The pattern to be printed may be the whole surface or a part of the printed matter, and the same effect can be obtained even if it is a pattern such as a fine pattern, a tint block, or a pattern.

If a portion of the printed matter is printed with this anti-counterfeit ink and the other portion is printed with a general color ink of the same color system containing no pearl pigment, the copy is forgery-prevented. Forgery will be easier to find, because only the areas printed with the ink for use will change color.

Furthermore, if a plurality of anti-counterfeit inks are prepared by changing the color tone of the colored color material and printing is performed by changing the printing location, a copy having a color tone completely different from the original printed matter can be obtained. .

The printed matter includes all that are required to be protected against copying, and as an example, a check, a stock certificate, a gift certificate, a gift certificate, a lottery ticket, a boarding ticket, a commuter pass, a bankbook,
This includes credit cards, ID cards, cash cards, prepaid cards and the like.

(Experimental Example 1) As an example, an anti-counterfeit ink (A) for gravure printing comprising a colored colorant (first colorant) having the following composition and a pearl pigment was prepared.

Coloring agent Microlith Green GK (manufactured by Ciba-Geigy Co., Ltd.) 1 wt% pearl pigment Iriodin No. 205 Iris color type (manufactured by MERCK) 11 wt% Binder Polyester resin (resin content 30%) Byron 20SS 58 wt% (manufactured by Toyobo Co., Ltd.) Organic solvent Methyl ethyl ketone: toluene = 1: 1 30 wt% Printing with this anti-counterfeit ink As a result, a printed matter having a dichromatic color tone of green and gold could be obtained.

(Results) The spectral reflectance spectral distribution a of this printed matter is as shown in FIG. The printed matter has a slightly increased whiteness due to the influence of the pearl pigment, and has a slight white color, but it has a peak near 500 nm, and it is visually recognized that the printed matter has a dichroic hue of green and gold. To be done.

This is a color copying machine (CANON CLC
500, also known as Pixel Dio500, manufactured by Canon Inc., trade name) to make a copy. Curve b in FIG. 1 is the spectral reflectance spectral distribution of this copy. It can be determined from the spectral reflectance spectral distribution that it is a copy. By visual observation, the printed matter is green or gold depending on the viewing angle, the copied matter is blue unlike the printed matter, and the gold color tone is not reproduced, and it can be easily discriminated that it is a copied matter.

Next, the anti-counterfeit printed matter will be described.
This anti-counterfeit printed matter is characterized by the anti-counterfeiting technology using the anti-counterfeiting ink and the reproducibility of the copying machine (coarse halftone dots are thick when copied, and fine halftone dots are not thinly reproduced on the contrary).
The anti-counterfeiting printed matter is a combination of anti-counterfeiting technology that utilizes two types, and has two printing areas with different density of halftone dots, and has a dichromatic color tone of green and gold and a discoloration effect due to copying by a copying machine. In addition, it has a high anti-counterfeiting effect that also provides a decoloring effect. FIG. 1b shows the positions of the printed matter a and the copied matter b on the Lab color system solid.

That is, a forgery-proof printed matter having a first print area formed of coarse halftone dots and a second print area formed of fine halftone dots, in which at least the first print area is a forgery first It was printed with a preventive ink. By adopting such a configuration, the anti-counterfeit printed matter changes its color due to the fact that the first printing area is printed with the preceding anti-counterfeit ink when copied by a color copying machine. Since the second print area is composed of fine halftone dots and is erased without being reproduced, it can be discriminated at first glance that it is a copy.

FIG. 2 (a) shows a copy 1a obtained by the present invention, and FIG. 3 (b) shows a copy 4a obtained by copying the copy-proofed print with a color copying machine.

In FIG. 2 (a), a forgery-preventive printed matter 1a
Are two print areas having different density of halftone dots, that is, a background portion 3a which is a first print area formed of coarse halftone dots and a latent image portion 2a which is a second print area formed of fine halftone dots.
And the latent image portion 2a and the background portion 3a are printed using the same anti-counterfeit ink of the present invention. In this example, the latent image portion 2a is formed as a warning mark X mark.

Since the latent image portion 2a of the anti-counterfeit printed matter 1a having the two-tone color tone of green and gold thus constructed is printed with the same anti-counterfeit ink as the background portion 3a, At first glance, it is difficult to recognize the existence of the latent image portion 2a, that is, the warning mark X in this example.

When a copy 4a is produced by copying the anti-counterfeit printed matter 1a with a color copying machine, the background portion 6a of the copy 4a is printed with the anti-counterfeit ink as shown in FIG. 2 (b). Therefore, the gold color tone is not reproduced with respect to the background portion 3a of the anti-counterfeit printed matter 1a, and the color is changed to blue. On the other hand, since the latent image portion 5a is composed of fine halftone dots, it is reproduced by the copying machine. The color is erased and visualized as a white warning mark X.

In this example, the background portion 3a, which is the first print area, and the latent image portion 2a, which is the second print area, are printed using the same anti-counterfeit ink, but the latent image portion 2a, which is the second print area, is printed. Even if the image portion 2a is replaced with a normal printing ink which is not the anti-counterfeit ink used for the background portion 3a, the latent image portion 2a is similarly erased and the background portion 3a is discolored when copied by a color copying machine. Can be obtained.

In this case, if the normal printing ink used for printing the latent image portion 2a has the same color or a hue similar to that of the anti-counterfeiting ink used for printing the background portion 3a, it looks like the above example. It is possible to obtain the anti-counterfeit printed matter 1a in which it is difficult to confirm the existence of the latent image portion 2a which is the second printing area.

FIG. 3 is an example of another anti-counterfeit printed matter, FIG. 3 (a) is an anti-counterfeit printed matter, and FIG. 3 (b) is a copy obtained by copying this anti-counterfeit printed matter with a color copying machine. is there.

In FIG. 3 (a), the anti-counterfeit printed matter 1b
Are two print areas having different density of halftone dots, that is, a latent image portion 2b which is a first print area formed of coarse halftone dots and a background portion 3b which is a second print area formed of fine halftone dots.
And the latent image portion 2b and the background portion 3b are printed using the same anti-counterfeit ink. In this example, the latent image portion 2b is formed as a warning mark X mark.

The counterfeit-proof printed matter 1b thus configured
The latent image portion 2b of the latent image portion 2b is printed using the same anti-counterfeit ink as the background portion 3b.
b, that is, it is difficult to recognize the presence of the warning mark X in this example.

When this anti-counterfeit printed material 1b is copied by a color copying machine to make a copied material 4b, the background portion 6b of the copied material 4b is composed of fine halftone dots as shown in FIG. 3 (b). It is not reproduced by a copying machine and is erased, while the latent image part 5
Since b is discolored with respect to the latent image portion 2b of the anti-counterfeit printed matter 1b, it is visualized as a discolored warning mark X mark.

In this example, the latent image portion 2b, which is the first print area, and the background portion 3b, which is the second print area, are printed using the same anti-counterfeit ink, but the background, which is the second print area, is printed. Even if the portion 3b is replaced with a normal printing ink which is not the anti-counterfeit ink used in the latent image portion 2b, the background portion 3b is erased and the latent image portion 2b is discolored in the same manner when copied by a color copying machine. Can be obtained.

In this case, if the normal printing ink used for printing the background portion 3b is the same or similar in hue to the anti-counterfeit ink used for printing the latent image portion 2b, it looks like the previous example. It is possible to obtain the anti-counterfeit printed matter 1b in which it is difficult to confirm the existence of the latent image portion 2b, which is the first printing area, only by itself.

Although FIGS. 2 and 3 show an example in which the entire surface of the anti-counterfeit printed matter is composed of the first printing area and the second printing area, at least the first printing area and the second printing area are counterfeit. Since a similar anti-counterfeiting effect can be obtained if it is on a part of the printed matter, even if the other parts except the first printing area and the second printing area are white background, other printing may be performed. good.

Further, the first print area and the second print area are formed by a continuous print pattern such as a tint block, or if incorporated as a part of the print pattern, the first print area and the second print area are further formed. It becomes difficult to distinguish between the two, and it is difficult to recognize the existence of the latent image portion with the naked eye.

In the anti-counterfeit printed matter shown in the examples of FIGS. 2 and 3, the coarse halftone dots constituting the first print area are 50 to 100 lines, and the halftone dot area ratio is 5 to 46%.
In addition, there are 12 fine dots forming the second print area.
A combination that looks uniform to the naked eye can be selected from the range of 0 to 200 lines and the halftone dot area ratio of 5 to 46%.

For example, in the example of the anti-counterfeit printed matter 1a shown in FIG. 2, the background portion 3a, which is the first printing area, has coarse halftone dots 6
When it is configured with 5 lines and a halftone dot area ratio of 30%, if the latent image portion 2a that is the second print area is configured with 150 fine dots and a halftone dot area ratio of 22 to 30%, the latent image portion 2a will appear as a latent image. The image portion 2a becomes inconspicuous.

In the forgery-preventing printed materials 1a and 1b shown in FIGS. 2 (a) and 3 (a), the latent image portions 2a, 2 are used for convenience of drawing.
Although the distinction between b and the background portions 3a and 3b is clearly expressed, it is possible to print the actual printed matter so that it is difficult to distinguish it with human eyesight.

[0047]

As described above, according to the present invention, the reflectance of the printed matter is increased by the second color material, and the reproducibility of the copy is lowered by inhibiting the exposure of the specific component of the reflected light. Since it does not use a special color material that utilizes the difference in human visual acuity and the sensitivity of the photoconductor,
Even when the color material is selected from a wide range, it is possible to prevent forgery by the color copying machine. In addition, even when a colorant having an arbitrary color tone is used by combining the anti-counterfeit technology using the anti-counterfeit ink and the anti-counterfeit technology utilizing the reproducibility of the copying machine, high resolution is obtained. Even in the case of copying with a color copying machine, it is possible to easily discriminate forgery using the copying machine. Especially when printing printed matter with this anti-counterfeit ink,
When a printed image is formed by specific halftone dots or coarse and dense lines, a forgery effect can be added in addition to the above-mentioned discoloration, and forgery can be more easily discriminated. In addition, the printed matter exhibits an iris color due to the action of the pearl pigment contained in the anti-counterfeit ink, whereas the copied matter does not have the iris color, and therefore does not have a dichroic color tone, making it easy to judge the copied matter. Is. Also, by changing the thickness of the metal oxide such as titanium oxide that covers the mica that constitutes the pearl pigment in the anti-counterfeit ink, it is possible to emphasize a specific color of the iris color, so it is emphasized on the printed matter. The difference between the reproduced color and the color on the copy is enlarged, and the determination of the copy becomes easier.

[Brief description of drawings]

FIG. 1 is a graph showing spectral reflectance spectral distributions of a printed matter and a copy.

FIG. 2 is an explanatory plan view of an anti-counterfeit printed matter and a copy.

FIG. 3 is an explanatory plan view of another forgery-proof printed matter and a copy.

[Explanation of symbols]

 1a, 1b Anti-counterfeit printed matter 2a, 2b Latent image part 3a, 3b Background part 4a, 4b Copies 5a, 5b Latent image part 6a, 6b Background part

Claims (6)

[Claims] 1. An ink containing at least an optional colorant and a pearl pigment, wherein the component ratio (weight ratio) of the colorant and the pearl pigment is in the range of 1: 0.1 to 1:99. An anti-counterfeit ink characterized by the following. 2. The pearl pigment is characterized in that mica having a refractive index of 1.6 or more is coated with a metal oxide, and the pearl pigment having a refractive index of the metal oxide of more than 2.0 is used. The ink for forgery prevention according to Item 1. 3. The anti-counterfeit printed matter according to claim 2, wherein a pearl pigment in which the thickness of the metal oxide coating the mica is at least 200 to 2000 angstrom is used. 4. The metal oxide coating the mica,
At least Sb ₂ S ₃ , Fe ₂ O ₃ , PbO, ZnS
e, CdS, Bi ₂ O ₃ , TiO ₂ , PbCl ₂ , Ce
O ₂ , Ta ₂ O ₅ , ZnS, ZnO, CdO, Nd ₂ O
_The anti-counterfeit printed material according to claim 2, wherein a pearl pigment coated in a single layer or two layers selected from ₃ , Sb ₂ O ₃ , SiO and InO ₃ is used. 5. An anti-counterfeit ink is printed in a single color or a plurality of colors in at least a part of a printed portion, and the anti-counterfeit ink is an ink containing at least an optional colorant and a pearl pigment. The component ratio (weight ratio) of the colored material and the pearl pigment is 1: 0.1.
A forgery-proof printed matter characterized by being in the range of 1:99 to 1:99. 6. An anti-counterfeit printed matter having a first print area formed of coarse halftone dots and a second print area formed of fine halftone dots, wherein at least the first print area is the anti-counterfeit print. The forgery-preventing printed matter according to claim 5, which is printed using a printing ink.