JP2000319559A - Ink for detecting false bank notes and for security certification and detection certification - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for detecting false bank notes with a small amount of an ink which can be readily obtained from readily available chemicals by using easy-to-handle and inexpensive tools through prompt and simple operations with high certainty in no need of expensive and large-sized apparatus and complicated operations, in addition, a method for certifying sheets of security paper and the ink therefor. SOLUTION: A bank note or a sheet of security paper is spotted with this ink and the color change at the spotted part is observed after a desired time. In the case of a false bank note, the color tone changes dark from the original color at the ink-spotted site to dark brown to gray purple; on the other hand, in the genuine bank note, no change in the color is observed where the starch included false bank notes is detected with the ink including iodine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a fake bill or authenticating security paper and an ink therefor.

[0002]

BACKGROUND OF THE INVENTION Since banknotes were conceived and used, governments around the world have been worried about the issue of counterfeit bills.
In addition, exchange of security papers describing private rights and obligations is indispensable in economic activities and social life, and counterfeiting is also a serious problem as disrupting social order. Banknotes and security papers are also copied and printed, and in recent years the development of electronic copy technology has made it more difficult to distinguish between genuine and fake. As counterfeiting has become a more social problem, devices, devices, and devices that detect counterfeit bills and authenticate security paper
Along with machines and the like, methods have been devised in which special invisible chemicals are included in paper or printed, and these are detected and detected by light or magnetism. However, many of these devices and systems are also not reliable, are mechanically expensive, and in some cases are bulky and often complex in design.

[0003]

SUMMARY OF THE INVENTION The basic object of the present invention is to provide a reliable and quick and simple operation using an easy-to-handle and inexpensive tool without the need for expensive and large equipment or complicated operations. Another object of the present invention is to provide a method for detecting counterfeit bills and authenticating security paper by using a small amount of a safe ink that can be produced from easily obtained chemical substances, and an ink for the same.

[0004]

SUMMARY OF THE INVENTION According to the present invention, ink is applied to banknotes or security papers to detect counterfeit bills or authenticate security papers, and furthermore, by waiting for a required time,
By observing the color change of the ink-applied portion, it is possible to distinguish the genuine product from the fake product, thereby solving the problem.

[0005] In the case of a genuine bill, the color before ink application and the color after the required time have elapsed are the same. However, if it is a fake paper, the color before ink application and the color after the ink application and the required time have elapsed are different. After the required time, the two parts can be distinguished from each other by blackening of the inked part.

[0006] Since banknotes have been conceived and used, the issue of counterfeit bills for government agencies all over the world that issue banknotes has not only impaired the economic activities of nations, but also involved in inter- It has continued to plague government officials as a matter of trust. In addition, exchange of security papers describing private rights and obligations is indispensable in economic activities and social life, and forgery of these is also a serious social problem as disturbing the public interest order and peace of business of society. Thus, the counterfeiting problem is a major problem to be solved for security paper as well as banknotes.

The security paper is a document in which private rights and obligations having a property value are described or a paper used for the document. Typical examples of the use of this paper include checks, travelers checks, money orders, bank notes, bearer bills, bonds, stock certificates, stamps, postal money orders, identification cards, registration certificates, various government agencies. Certificates of issuance, certificates such as driving licenses, licenses and permits, ballot papers for elections, passbooks, passports, lottery tickets, admission tickets, travel tickets, receipts, coupons, vouchers, bills of lading, banks Vouchers, signature fields of credit cards, bank cards, ID cards, and the like.

[0008] The most required to detect and authenticate the authenticity of these bills and security papers is, for example,
Banks, post offices, airline tellers, sports facilities,
He is also a direct sales clerk at ticket offices and ticket collectors at theaters and in general retailing. For people in such a position, large devices, expensive devices, and complicated operations are not suitable for easily detecting and authenticating the authenticity of bills and security paper.

Banknotes and security papers are also more difficult to distinguish between genuine and fake due to the development of copying, printing and, more recently, electronic copy technology.
As the fake bill problem becomes a more social issue and more secure transactions of security papers are required, special invisible drugs along with devices, devices, machines, etc. that detect fake bills and authenticate security papers A method has been devised in which paper is printed or printed, and these are detected and detected by light or magnetism such as an ultraviolet lamp or a black light. However, many of these devices and systems are also not reliable, are mechanically expensive, and in some cases are bulky and often complex in design. Therefore, development of a method for detecting forged bills and imitation / forged security paper by a quick and simple method has been required.

[0010] It is well known that starch is used as a sizing agent in the production of paper. Also, James P. Casey “Pu, et al. States that treating paper with an iodine-potassium iodide solution can produce a blue color as a method of quantitatively evaluating the amount of starch as a composition in the paper.
lp and Paper Chemistry and Chemical Technology ”3r
d. vol.3, 1894pp (1981). However, the use of an iodine-starch reaction with an iodine-potassium iodide solution for quantitative and qualitative determination of the amount of starch in a banknote or the fact that starch is not contained or contained in a banknote contains only trace amounts chemically. There is no description about whether or not. The present inventor performed a quantitative detection of the amount of starch in a banknote by an iodine-starch reaction using an iodine-potassium iodide solution.
They found that starch in Singapore, China and Australia is almost free of starch. In addition, it was found that the paper used in the check book of the Ministry of Posts and Telecommunications, the stamp, and the paper used in the column on the back of the driver's license issued by the Public Safety Commission did not contain starch. On the other hand, commercially available general paper, for example, copy paper, bond paper,
It was also found that any paper such as form paper, imitation paper, drawing paper, and stationery contains a large amount of starch. Furthermore, various types of stock certificates and checkbooks issued by city banks were also checked for the presence of starch.Many of these security papers contained starch, and all of the security papers mentioned above contained starch. It turned out that it was not possible. Some security papers contain starch even if they are authentic, but the ink of the present invention is effective for security papers that do not contain starch with higher security. It is obvious that whether or not the effects of the present invention can be used as security paper can be easily and quickly confirmed by actually applying the ink of the present invention to the paper.

Based on these facts, the present inventor has completed the present invention as a method for verifying the authenticity of bills and papers requiring security.

The basic principle of the present invention is to detect the authenticity of a banknote by detecting the starch in the banknote. Heretofore, many chemical reactions showing color development, discoloration or decoloration have been known. Among these numerous reactions, as a system that reflects the purpose of the present invention in the above-described reaction to starch, the materials used are inexpensive and affordable, and the detection and detection are sharp and pale to dark brown to gray-blue-purple. Attention was paid to the iodine starch reaction, which is a color change that is easily recognized as a change to a darker color. The ink of the present invention is a light yellow-brown liquid, and when applied to paper containing no starch, the color of the applied area does not change from the color of the paper, and the area where the ink is applied even after the required time has elapsed Does not change color. This is due to the fact that starch, which can form a dark brown to gray-blue violet complex with the ink, is not present in genuine banknotes. On the other hand, when the ink of the present invention is applied to a counterfeit bill prepared using readily available paper, the ink of the present invention reacts with starch to form a brown-gray-blue-violet complex, and the color of the portion where the ink is applied changes to black.

An important point in detecting the authenticity of a bill is to mark the bill. According to the laws of many countries, any kind of marking is often not allowed on banknotes. For this reason, the ink of the present invention needs to be erased without leaving any trace after it is marked on a banknote and subjected to detection and authentication. The inks of the present invention also take this point into account, and consideration of their composition indicates how excellent the present invention is. That is, as long as the bill is genuine, the ink of the present invention does not leave any trace even if it is attached to the bill,
The chemical component of the ink of the present invention, which is a composition thereof, is a colorless substance that is physiologically and environmentally safe over time from the site where the ink is applied, even after the substance that can volatilize and other components volatilize. And the inks of the present invention comprise a concentration range that is physiologically and environmentally safe for the human body in handling.

The ink of the present invention is harmless to the human body, has a low environmental load, and contributes to social public interest and peace of business.

The ink of the present invention comprises iodine and a suitable solvent, and is preferably a solvent selected from a group consisting of water, ketones, esters, ethers, alcohols and alkali metal iodide solutions. .

In the ink of the present invention, a good performance effect can be obtained by using only water as a solvent. However, in order to enhance the quick-drying property of the ink, alcohols such as ethanol and isopropyl alcohol, and smooth writing properties are required. It is also particularly preferable to include polyhydric alcohols such as ethylene glycol and glycerin at a weight ratio of about 15% to about 80% to prevent solidification due to drying of the ink on the felt core. .

The alkali metal iodide in the ink of the present invention is preferably selected from the group consisting of sodium iodide and potassium iodide.

The composition of the ink of the present invention is about
It consists of about 0.02% to about 3.2% iodine and alkali metal iodide, about 20% to about 85% water, and about 15% to about 80 alcohols. By changing the composition of the content composition in various ways, the color tone of the site where the ink of the present invention is discolored when applied to paper or counterfeit bills containing starch.
It is also possible to vary the color density and the time required for color development in various ways.

Ketones that can be used in the ink of the present invention include acetone, methyl ethyl ketone, diethyl ketone, propyl ketone, and isopropyl ketone. Esters include methyl, ethyl, and alkyl as alkyl groups.
Of monohydric alcohols such as propyl, isopropyl, butyl, isobutyl, pentyl, isopentyl and so-called amyl and polyhydric alcohols such as glycerol, ethylene glycol, propylene glycol, diethylene glycol, hexylene glycol, sorbitol and 1,3-propanediol Alcoholic formic acid,
Acetic acid, propionic acid, lactic acid ester and the like, ethers, methyl, ethyl, propyl, butyl, isopropyl, alkyl alkyl ether to dialkyl ether comprising an alkyl group such as isobutyl further ethylene glycol, propylene glycol, hexylene glycol, There are monoalkyl ethers and dialkyl ethers of dihydric alcohols such as 1,3-propanediol, diethylene glycol and triethylene glycol, and the alcohols include ethanol, propanol,
Butanol, pentanol, isopropyl alcohol,
Including monohydric alcohols such as isobutyl alcohol and so-called amyl alcohol, ethylene glycol, propylene glycol, hexylene glycol, 1,3-propanediol, dihydric alcohols such as triethylene glycol, triethylene glycol, and trihydric alcohols such as glycerol, There are polyhydric alcohols such as sorbitol, etc., and the alkali metal iodide solution is water of an appropriate concentration of the alkali metal iodide and / or at least one selected from the above ketones, esters, ethers, and alcohols. One or more solvent solutions.

According to an embodiment of the present invention, an ink is applied,
After the required time, the color change at the site subjected to the test is observed. The time required for the color change varies depending on the solvent composition of the ink, the amount of starch contained in the paper and the surface condition of the paper, but when tested on banknotes or security paper, the ink of the present invention can be used within a matter of seconds or a few seconds. A sharp coloration of the starch reaction is seen. If the paper contains no paper money, no starch or only chemically trace amounts,
The color of the tested portion is colorless to colorless or does not change from pale light yellowish brown due to the wetting of the ink on the inked portion, and when the banknote is fake or paper containing starch. The color changes from pale light yellowish brown to dark brown to grayish blue purple. This sharp change in the darkness of the iodine-starch reaction allows the color change to be visually observed even when the ink of the present invention is printed as a small amount of spots.

Such a color change coloration is caused by the fact that iodine in the ink reacts with the starch in the counterfeit bill or the starch in the paper containing the starch to form a dark brown to gray-blue purple complex. In contrast, more secure paper that does not contain genuine banknotes or starch,
Iodine in the ink does not react and no color change is observed because it contains little or no trace of starch.

In addition to using iodine and an alkali metal iodide as reagents for producing an iodine-containing ink, povidone-iodine which is a solution of a compound of polyvinylpyrrolidone and iodine as a preparation containing iodine,
Alternatively, they have found that it is possible to use iodine tincture, which is an iodine refiner composed of iodine, potassium iodide, ethanol, and water. 11th Revision of the Japanese Pharmacopoeia (1
986), povidone iodine (PVP-I), which is a compound of polyvinylpyrrolidone and iodine, isodine (Meiji Seika Co., Ltd.), Neoyodin (Iwaki Pharmaceutical Co., Ltd.), Popiral (Asgen Pharmaceutical Co., Ltd.), Mast Clean ( It is sold under product names such as Iwaki Pharmaceutical Co., Ltd., and is a readily available drug, and is widely used as a germicidal antiseptic for hulls and a mouthwash. A commercially available gargle using povidone-iodine (gargle) may be described as containing 70 mg of povidone-iodine (7 mg of effective iodine) in 1 ml as a component amount, and the required amount for use, for example, 15 to 30 times with water. It is diluted and used as a mouthwash. Also, it is used as a disinfectant by using ethanol and water in appropriate amounts based on the method for producing alcoholic beverages specified in the Japanese Pharmacopoeia. Further iodine 5.7 ~
6.3W / V% and potassium iodide 3.8-4.2W / V% and 70V / V%
Iodine tincture made from an appropriate amount of ethanol is used for skin disinfection of the surgical site and for the treatment of skin diseases caused by bacteria and fungi in the dermatological field, adding 2 to 4 drops to a glass of water,
It may be used internally or as a gargle as an antiemetic. However, it has not yet been known that a preparation containing povidone-iodine and tincture of iodine can be used for detecting and authenticating the bill or security paper of the present invention.

The present inventor described in the Japanese Pharmacopoeia manual a solution of such a compound of polyvinylpyrrolidone and iodine, for example, a preparation containing povidone iodine, or an iodine purified, for example, iodine consisting of iodine, potassium iodide, ethanol and water. The method is to dissolve in ethanol or a mixture of ethanol and water, and further dilute with water and a solvent selected from the group consisting of ketones, esters, ethers, and alcohols. The resulting ink is applied to the banknote, and after a required time, the change in the color of the site to which the ink is applied is observed. In the fake bill, the initial color of the site to which the ink is applied changes to dark brown to grayish blue-purple. However, it is included in fake bills that the color of the inked part does not change with genuine banknotes Npun was also found that it is possible to obtain an ink that matches the purpose of the present invention for detecting an ink containing iodine.

When a preparation or iodine tincture containing povidone-iodine is diluted with a method for producing alcoholic beverages, that is, ethanol or a mixture of ethanol and water, or alone from the group consisting of water and the above-defined ketones, esters, ethers, and alcohols. Alternatively, the composition of iodine and potassium iodide when diluted with a plurality of selected solvents is preferably about 0.02% to about 3.2% by weight. If the density is too low, the color density of the color development is low and it is difficult to discriminate and identify, and the storage stability of the ink over time deteriorates. If the density is too high, when genuine banknotes are inked, traces of light brown ink may be left on the paper surface for a short period of time.

As a solvent to be diluted, not only 70V / V% ethanol of the local government but also water alone can obtain good performance effects. However, alcohols such as isopropyl alcohol, etc. Polyhydric alcohols such as ethylene glycol and glycerin may be included at a ratio of about 15% to about 80% by weight to ensure smooth writing and prevent solidification due to drying of the ink on the felt core. This is particularly preferred.

The inks of the present invention are packaged in containers of various sizes and forms in small portions and can be marked by known existing methods. For example, it can be packed in a writing implement container such as a pen, a brush, a stamp, and the like, and can be used quickly and simply by making the same marking as a marker pen. In addition, the detection and authentication of a large number of banknotes and security papers can be performed by using an ink-jet type marking system. Also,
As a preference for use, perfume chemistry overview
It is also possible to mix perfume prepared from ketones, esters, ethers, and alcohols described in (Osamu Okuda, Hirokawa Shoten) in an appropriate amount to impart perfume.

Hereinafter, the present invention will be described with reference to examples.

[0028]

Example 1 An aqueous solution 4 of 4.0 g of potassium iodide was placed in a brown bottle.
80 g is added, and 2.0 g of iodine is added and dissolved therein. An ink is prepared by adding 128 g of ethanol, 140 g of isopropyl alcohol, 100 g of diethylene glycol and 150 g of ethylene glycol. Fill the felt pen with this ink,
Put a centimeter-long mark on the print margin of genuine banknotes, check paper, stamps and photocopy papers, and stationery issued by the Ministry of Posts and Telecommunications of Japan. No genuine banknotes from Japan, the United States, Singapore, China, and Italy, or check paper or stamps issued by the Ministry of Posts and Telecommunications of Japan show any color change in the printed area even after 30 seconds. However, on photocopy paper and stationery, the marked portion printed instantaneously turns gray-violet. Even if this ink is stored in a dark 50 ° C constant temperature bath and the same test is performed six months later, there is no change in the color development and discoloration performance of the ink.
No genuine bills in China and Italy, or check paper or stamps issued by the Ministry of Posts and Telecommunications of Japan show no color change in the printed area even after 30 seconds, and instantly printed marks on photocopy paper and stationery The site turned gray-purple.

[0029]

Example 2 A brown bottle was charged with 100 ml of a povidone-iodine solution as a compound solution of polyvinylpyrrolidone and iodine, for example, isodine gaggle (manufactured by Meiji Seika Co., Ltd.), and 100 ml of 70% V / V ethanol, 100 ml of water, and ethylene glycol were added. Add 100ml to make ink. This ink is filled into a felt-tip pen, and a mark of 1 cm length is placed on the print margin of the genuine banknote, check paper, stamp and photocopy paper, and stationery issued by Japan Post. No genuine banknotes from Japan, the United States, Singapore, China, and Italy, or check paper or stamps issued by the Ministry of Posts and Telecommunications of Japan show any color change in the printed area even after 30 seconds. However, on photocopy paper and stationery, the marked portion printed instantaneously turns gray-violet. Even if this ink was stored in a dark 50 ° C constant temperature bath and the same test was conducted six months later, there was no change in the color development and discoloration performance of the ink.
Authentic banknotes in the United States, Singapore, China, and Italy, and check paper and stamps issued by the Ministry of Posts and Telecommunications of Japan
Even after 30 seconds, no color change was observed in the printed portion, and the marked portion of the photocopy paper and stationery was instantly printed and changed to a gray-blue purple color.

[0030]

Example 3 In a brown bottle, a dilute tincture of Japanese Pharmacopoeia, i.e., dilute tincture of iodine such as dilute tincture of Japanese Pharmacopoeia, obtained by diluting iodine tincture of the Japanese Pharmacopoeia, iodine consisting of iodine, potassium iodide, ethanol and water, twice with 70V / V% ethanol. Showa ”P
100 ml (manufactured by Showa Pharmaceutical Co., Ltd.) is added, and 450 ml of an aqueous solution of 5 g of potassium iodide, 75 g of ethanol, 150 g of isopropyl alcohol, and 150 g of diethylene glycol are added to obtain an ink. Fill the felt pen with this ink,
Put a centimeter-long mark on the print margin of genuine banknotes, check paper, stamps and photocopy papers, and stationery issued by the Ministry of Posts and Telecommunications of Japan. No genuine banknotes from Japan, the United States, Singapore, China, and Italy, or check paper or stamps issued by the Ministry of Posts and Telecommunications of Japan show any color change in the printed area even after 30 seconds. However, on photocopy paper and stationery, the marked portion printed instantaneously turns gray-violet. Even if this ink is stored in a dark 50 ° C constant temperature bath and the same test is performed six months later, there is no change in the color development and discoloration performance of the ink.
No genuine bills in China and Italy, or check paper or stamps issued by the Ministry of Posts and Telecommunications of Japan show no color change in the printed area even after 30 seconds, and instantly printed marks on photocopy paper and stationery The part turned gray-purple

[0031]

Comparative Example 2.8 g of iodine was placed in a brown bottle, and 20 ml of an aqueous solution of 8 g of potassium iodide was added thereto and dissolved. Add water to make 1000 ml. This ink is filled into a felt-tip pen, and a mark of 1 cm length is placed on the print margin of the genuine banknote, check paper, stamp and photocopy paper, and stationery issued by Japan Post. Japan, United States,
No genuine banknotes from Singapore, China, and Italy, and check paper or stamps issued by the Ministry of Posts and Telecommunications of Japan show no color change in the printed area even after 30 seconds. However, on photocopy paper and stationery, the marked portion printed instantaneously turns gray-violet. When this ink is stored for one month in a dark 50 ° C constant temperature bath, the color of the ink changes from brown to pale yellow, and the same test can be performed on genuine banknotes, check paper, stamps, as well as photocopy paper and stationery. No discoloration was observed.

[0032]

The present invention is reliable, does not require expensive and large equipment and complicated operations, uses easy and inexpensive tools, can be operated quickly and easily, and can be made from easily obtainable chemical substances. By using a small amount of ink that can be used with care, it is possible to provide a method capable of detecting a fake bill and authenticating security paper and an ink therefor.

Claims (16)

[Claims] 1. A banknote is coated with iodine-containing ink, and after a required time, a change in the color of the inked portion is observed. In a fake bill, the initial color of the inked portion is dark brown to gray-blue purple. A fake bill detection method for detecting starch contained in a fake bill with an iodine-containing ink, wherein the color of the inked portion does not change in a genuine bill, though it changes blackish, and an ink for that purpose. 2. The method of claim 1 wherein an ink comprising iodine is used. 3. The method according to claim 1, wherein an ink comprising iodine and a solvent selected from the group consisting of water, ketones, esters, ethers, alcohols and alkali metal iodide solutions is used. 4. The method according to claim 1, wherein the solvent is an ink selected from the group consisting of water, ketones, esters, ethers, and alcohols. 5. The method according to claim 1, wherein an ink comprising iodine, water, an alkali metal iodide selected from the group consisting of sodium iodide and potassium iodide, and a solvent selected from alcohols is used. 6. The method of claim 1 wherein the weight ratio of iodine and alkali metal iodide is from about 0.02% to about 3.2% and water is from about 20% to about 85%.
2. The method of claim 1 wherein the ink comprises about 15% to about 80% alcohol and about 15% to about 80% alcohol. 7. After a required time, the inked part is compared with a predetermined standard, and a genuine bill has no color change.
2. A fake bill results in a blackish result.
the method of. 8. A solution of a compound of iodine and polyvinylpyrrolidone, or iodine tincture, which is an iodine refiner consisting of iodine, potassium iodide, ethanol and water, is treated with water,
2. The method according to claim 1, wherein the ink is obtained by diluting with one or more solvents selected from the group consisting of ketones, esters, ethers, and alcohols. 9. An ink containing iodine in a security paper using paper containing only a trace amount that does not cause coloration in an iodine starch coloration reaction or containing chemically at all instead of the banknote in claim 1. After the required time, observe the change in the color of the inked area.In the case of fake security paper, the initial color of the inked area changes to dark brown to grayish blue-purple, but the authentic security paper In this paper, a security paper using paper that contains only trace amounts of starch that does not show color in the iodine starch coloration reaction or that does not contain chemically at all, that the color of the inked area does not change, is modeled. Security paper that detects the starch contained in the forged security paper with ink containing iodine. Proof method and ink for it. 10. The method of claim 9, wherein an ink comprising iodine is used. 11. Iodine and water, ketones, esters,
The method according to claim 9, wherein an ink comprising a solvent selected from the group consisting of ethers, alcohols and an alkali metal iodide solution is used. 12. The method according to claim 9, wherein the solvent is an ink selected from the group consisting of water, ketones, esters, ethers, and alcohols. 13. The method according to claim 9, wherein an ink comprising a solvent selected from an alkali metal iodide selected from the group consisting of iodine, water, sodium iodide and potassium iodide and an alcohol is used. 14. The method of claim 1 wherein the weight ratio of iodine and alkali metal iodide is from about 0.02% to about 3.2% and the water is from about 20% to about 8%.
The method of claim 9 wherein an ink containing 5% and about 15% to about 80% alcohols is used. 15. After a required time, the inked portion is compared with a predetermined standard, and further, the starch contains only trace amounts of no color in the iodine starch color reaction or contains no starch at all. 10. The method of claim 9, wherein the security paper using paper does not change color, and the counterfeit security paper imitating the security paper changes blackish. 16. A solution of a compound of iodine and polyvinylpyrrolidone, or iodine tincture, which is an iodine refiner composed of iodine, potassium iodide, ethanol and water,
The method according to claim 9, wherein the ink is prepared by diluting with one or more solvents selected from the group consisting of water, ketones, esters, ethers, and alcohols.