{"id":220,"date":"2019-02-02T17:27:31","date_gmt":"2019-02-02T17:27:31","guid":{"rendered":"https:\/\/dns-iran.com\/?page_id=220"},"modified":"2020-01-19T14:14:28","modified_gmt":"2020-01-19T10:44:28","slug":"security-inks","status":"publish","type":"page","link":"https:\/\/dns-iran.com\/index.php\/security-inks\/","title":{"rendered":"security inks"},"content":{"rendered":"\n

What types of security inks are there?<\/h3>\n\n\n\n

Security inks are available to protect printed materials in different guises. <\/p>\n\n\n\n

Invisible Ink <\/p>\n\n\n\n

One of the most widely used inks is invisible ultra violet and will \nbe revealed when the print is placed under a black lamp (or UV light \nsource). The ink is invisible to the eye (covert) under normal lighting \nconditions. When passed under a uv lamp the ink glows and is used \npredominantly for cheque printing and document protection in the UK. It \nis relatively cheap and is available in many colours. The ink must be \napplied to a UV dull substrate<\/a> otherwise it will not be visible.<\/p>\n\n\n\n

Thermochromic Ink<\/p>\n\n\n\n

Thermochromic inks are sensitive to temperature changes and will \nappear or disappear at different temperature ranges. If you were to \napply a finger and thumb to a 15 \u00b0C dark blue printed thermo spot the \nink would disappear to nothing and as soon as you removed the heat \nsource the ink would re-appear again. Inks come in various temperature \nsensitivities and common temperatures available are 15\u00b0C, 31\u00b0C and \n45\u00b0C. An important consideration would be where the ink is to be \nlocated. In hotter climates you may well have to go for a higher \ntemperature as the ink could be invisible from the ambient temperature \nitself. Some are available as a permanent change. e.g. when it has \nreached a temperature the ink colour does not reverse – this may be used\n on labelling for food product packaging where you could see if an item \nhas thawed out and would be dangerous to re-freeze again. <\/p>\n\n\n\n

Solvent Sensitive Ink (reactive) <\/p>\n\n\n\n

As the name states, would present a visible indicator that the ink \nhas been attacked by a solvent (usually attempt to remove variably \nprinted information such as a cheque). You will mainly find this being \nused on a printed watermark or fine guilloche artwork design. Once a \nsolvent has been applied the ink will change colour to show that \nalteration has been attempted. <\/p>\n\n\n\n

Optically variable ink<\/p>\n\n\n\n

OVI’s contain minute flakes of metallic film. As the viewing angle is\n altered the colour morphs from one to another. This needs to be printed\n with a fairly heavy weight to get the best results. The inks are very \nexpensive and are usually printed in small areas. Such examples would be\n in currency printing and visa’s. The most common colour changes are \nbrown to green (and vice versa) as well as red to purple. You will also \nnotice that the ink feels almost embossed on the substrate which is due \nto the amount of ink required to get the required effect. <\/p>\n\n\n\n

Magnetic Ink<\/p>\n\n\n\n

Magnetic inks are mainly used for serialisation and numbering \npurposes. The ink contains small magnetic flakes and allows a number to \nbe machine read. The most common application is is cheque printing and \nyou will find it on the MICR numbering portion of the bottom of a \ncheque. This will usually contain the cheque number, account number and \nsort code of the bank. <\/p>\n\n\n\n

Biometric Ink<\/p>\n\n\n\n

Biometric inks contain DNA taggants that can be machine read or react\n to a reading solvent. This allows for verification of a genuine product\n and each batch of printed documents can contain different biometric \nproperties. These are completely covert but require specialist methods \nto validate the authenticity. <\/p>\n\n\n\n

Fugitive Ink (water based)<\/p>\n\n\n\n

Fugitive ink works similarly to solvent sensitive ink in the fact \nthat any form of alteration (with water or an aqueous solution) will \nmake the ink run so that the printed pattern or area becomes smudged, \ntherefore indicating that a forgery or alteration has taken place. \nThese, again, will be found on cheques and if you are to wet your finger\n with saliva and wipe across the background, you would see the ink \nsmudge. <\/p>\n\n\n\n

Secondary Fluorescing Ink<\/p>\n\n\n\n

This ink works in the same way as fluorescing ink however it will not glow or show under a UV lamp UNLESS alteration has occurred. This is a secondary measure to protect against tampering and alteration. Quite often you will have an invisible ink that fluoresces green under a UV lamp and a secondary ink that will fluoresce red so that tampering or alteration is obvious. <\/p>\n\n\n\n

Bleeding Ink<\/strong><\/p>\n\n\n\n

Bleeding ink prints in black but when exposed to any aqueous solution\n it will produce a red stain. Authenticity of a document can easily be \ntested without the use of any special agents. User can just wet a finger\n and run it across the ink to instantly see the affect of the bleeding \nink. This ink is only available for use on dry offset printing.<\/p>\n\n\n\n

Coin Reactive Inks<\/strong>The image printed from this ink is white or \ntransparent. The image is revealed when the edge of a coin is rubbed \nover the ink. This provides for immediate verification of document \nauthenticity without the use of any special devices. Coin reactive ink \ncannot be scanned or copied. This ink is available for use with wet or \ndry offset and flexographic printing.<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

Erasable Ink<\/strong><\/p>\n\n\n\n

Erasable ink is used on the background of a document so that when an \nattempt is made to erase information, the ink rubs off in that area. The\n ink will also react in the same manner as solvent\/chemical reactive \ninks do, giving you two security features in one. Erasable inks are used\n on scenic or pantograph backgrounds on checks and certificates. This \nink is not recommended when imprinting a document through a laser \nprinter. The high temperatures associated with laser printers will cause\n problems within the printer when erasable ink is used. Erasable ink is \navailable for wet or dry offset printing.<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

Pen Reactive Ink<\/strong><\/p>\n\n\n\n

A transparent ink that  becomes visible with the use of a special \nfelt tip pen. The use of the pen is necessary to verify authenticity but\n can also be used to void a document that is no longer in use. Pen \nreactive ink is available for dry offset printing.<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

Heat Reactive \u2013 Irreversible<\/strong><\/p>\n\n\n\n

Heat reactive-irreversible ink is colorless when printed. When it is \nexposed to heat between 185\u00b0F (85\u00b0C) and 212\u00b0F (100\u00b0C), sharp color \nappears and does not disappear once the temperature is lowered. This \nfeature helps protect documents or sealed envelopes from being tampered \nwith by the use of steam or heat. Heat reactive-irreversible ink is only\n available for use on dry offset presses.<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

Visible Infrared Inks<\/strong><\/p>\n\n\n\n

Infrared visible inks are available in readable and disappearing ink.\n When printed they can look the same but when viewed under infrared \nlight, one will be readable and one will disappear. One example of using\n these two inks as a security feature would be to print a bar code using\n both inks. Print the actual readable area of the bar code with the \ninfrared readable ink and other areas of the bar code with the infrared \ndisappearing ink but making it look like a regular bar code. When read \nby a bar code scanner, only the infrared readable is read by the \nscanner. If a forger tries to duplicate the bar code as it looks on the \nprinted document, using regular inks, the bar code would be rejected \nwhen read by the scanner because the scanner would read the entire bar \ncode. Visible infrared ink is available for wet or dry offset printing.<\/p>\n\n\n\n

Optically Variable Inks<\/strong><\/p>\n\n\n\n

The color of optically variable ink changes when viewed from \ndifferent angles. The special effect from this type of ink cannot be \nduplicated by a scanner or copier. A small area of a document could be \nprinted in this ink to verify authenticity.<\/p>\n\n\n\n

Penetrating Ink <\/strong><\/p>\n\n\n\n

Penetrating inks contain a penetrating red dye that goes into the \nfibers of the paper and will show through to the back of the document. \nPenetrating inks are commonly used on the arabic and MICR numbering of \nnegotiable documents to deter forgers from trying to scrape the number \noff from the document. If the number is scraped off the red stain \nremains on the document. Also, if these documents are duplicated, the \nreproduction could be easily spotted by checking for the appearance of \nthe red stain on the back of the document. Penetrating inks are \navailable for letter press or wet offset printing.<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

Photochromic Ink<\/strong><\/p>\n\n\n\n

Photochromic ink can be colored or colorless. When it is\n exposed to UV light it instantly changes colors. Once the source of UV \nlight is removed it will change back to its original color. The unique \nproperties of photochromic ink cannot be reproduced by a scanner or \ncopier. The authenticity of a document with photochromic ink on it can \neasily be checked by exposure to sunlight, UV lights or other strong \nartificial lights. This ink is available in wet or dry offset and \nflexographic printing.<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

Solvent\/Chemical Reactive Inks<\/strong><\/p>\n\n\n\n

This type ink reacts to solvents or chemicals, such as \nbleach, alcohol or acetone. The solvents or chemicals are used by a \nforger to wash away or alter information on a document. When exposed to \nthe solvents or chemicals, these inks will run, change color, or cause a\n stain to develop. Tampering is easily detected when chemicals or \nsolvents are used on these inks. Solvent\/chemical reactive inks are \navailable for wet or dry offset printing.<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

Thermochromic Ink<\/strong><\/p>\n\n\n\n

Thermochromic ink changes color when exposed to heat and then changes\n back to its original color when cooled. When an area of a document is \nprinted with thermochromic ink, it can easily be tested for authenticity\n by holding or rubbing the area between fingers to activate the color \nchange. This property cannot be reproduced by a copier. Thermochromic \nink is available for wet or dry offset printing and flexographic \nprinting.<\/p>\n\n\n\n

Water Fugitive Ink<\/strong><\/p>\n\n\n\n

When water fugitive ink comes in contact with water or any aqueous \ntype of solution, it will run and stain the document. If a forger tries \nto wash away an image it would be very obvious. Water fugitive ink is \navailable for dry offset printing.
\nUV Invisible Fluorescent Inks<\/strong><\/p>\n\n\n\n

UV invisible fluorescent ink is transparent white or colorless and \ncan only be detected under ultraviolet light. If a portion of a secure \ndocument is printed with this ink, it can be quickly checked for \nauthenticity by viewing under a UV light. UV invisible fluorescent inks \ncannot be reproduced on a scanner or copier. This ink is available for \nwet or dry offset, flexographic and gravure printing.<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

There are many types of ink being manufactured<\/a> today.. Security ink is used for printing on passports, checks, some secure documents, and security labels just to name a few applications. There are several different types of security ink available for these applications that the following will cover.<\/p>\n\n\n\n

\"Security<\/figure><\/div>\n\n\n\n
  1. Biometric \u2013 <\/strong>Biometric, as its name implies, \ncontains DNA tags. Special machines are designed that can read the tags,\n or the tags can be manufactured to react when a particular solvent \ncomes in contact with them. Biometric ink is suited for applications \nwhere authentic product verification is necessary. Special methods are \nused to validate the authenticity of biometric ink printed products.<\/li>
  2. Reactive \u2013 <\/strong>Reactive ink is also referred to as \nsolvent sensitive. This type of ink can detect when there is an attempt \nto alter the document. An example of reactive ink is found on checks \nwhere variable data is printed on them. Watermarks are created with \nreactive ink.<\/li>
  3. Optically Variable \u2013 <\/strong>Optically variable ink is also\n known as OVI in industry circles. Tiny flecks of metallic film that \nchanges color when viewed from different angles. It\u2019s somewhat like \nholograms. OVI ink is extremely expensive and must be printed in heavy \nweight. It\u2019s used for passports and currency, for example. Color \nvariations can include changing from brown to green then green to brown,\n or red to purple then purple to red respectively.<\/li>
  4. Secondary Fluorescing \u2013 <\/strong>Fluorescing is an ink that \nbecomes visible when it\u2019s exposed to UV light. Like reactive ink, it\u2019s \npurpose to detect alterations and tampering on the material upon which \nit\u2019s used. For instance, the secondary fluorescing ink will look green \nunder UV light, but turns red (the secondary color) if tampering has \noccurred.<\/li>
  5. Thermochromic \u2013 <\/strong>As the name implies, thermochromic \nink is designed to be sensitive to temperature. It will appear or \ndisappear when it\u2019s exposed to different temperatures. While it comes in\n a variety of temperature sensitivities, but the most common are 15.the \nmost common are 15.31, and 45 degrees Celsius. Before using this \nindustrial ink, it\u2019s vital to consider the temperature conditions to \nwhich it will be exposed from the time of imprinting through its \nlifecycle.<\/li>
  6. Invisible \u2013 <\/strong>Invisible ink is used to protect \ndocuments like checks. This type of ink is designed to be invisible to \nthe naked eye, but visible under ultraviolet light much like fluorescing\n ink. Black light is the most common light source for making invisible \nink visible.<\/li>
  7. Magnetic \u2013 <\/strong>Magnetic ink is used where numerical \nsequences or serial number security is important. Magnetic ink contains \nmagnetic flakes designed to communicate with electronic readers for \ndocument verification. It\u2019s another ink used for checks MICR numbers in \nthe UK. That MICR number holds highly sensitive data like check number, \naccount number, and sort code.<\/li>
  8. Water-Based Fugitive \u2013 <\/strong>Fugitive ink sounds \nmysterious, but it is designed to react much the same way as reactive \nink. When an alteration attempt is made on a document with fugitive ink \nusing any kind of liquid, including water, the ink will run, causing it \nto smudge and become unreadable. Even your finger with saliva on it will\n affect the printed background of a check or document with fugitive ink \non it.<\/li><\/ol>\n\n\n\n

    DNS\u2019s principal objective is to provide our customers with the highest level of document protection available in the market.<\/p>\n\n\n\n

    Security inks are just one of the vital components that can be added to the production process.<\/p>\n\n\n\n

    Security inks have improved considerably over recent years and differ significantly to standard inks due to the wide range available and the complexity of the products.DNS have developed the necessary skills in utilizing specialist inks to deliver high quality secure products across various sectors.<\/p>\n\n\n\n

    Different considerations are required when trying to \nsafeguard a document and today\u2019s inks have advanced to reflect an ever \nchanging market.It is very important to verify the target authentication\n method.How is the product checked \u2013 overtly or covertly?<\/p>\n\n\n\n

    Visual effects such as fluorescent and heat reactive inks are notable methods for instant verification of authenticity, alongside concealed features for covert detection are both crucial when protecting against fraud and counterfeiting.   <\/p>\n\n\n\n

    there are different type of inks as bellow:<\/p>\n\n\n\n

    Tamper evident <\/strong><\/p>\n\n\n\n

    Where there is a concern that fraudsters are likely to \nalter or tamper with your document, there are measures that we can put \nin place to help identify that interference has occurred.A diverse range\n of tamper evident inks are available to aid detection when a document \nis susceptible to fraud.<\/p>\n\n\n\n

    Solvent Sensitive ink<\/strong> has been devised to identify \nwhen there has been an attempt to remove or amend printed data from \nitems such as cheques or tickets. The ink will smear or change colour \nwhen exposed to solvents. This will ordinarily be applied on printed \nwatermarks and fine line designs.<\/p>\n\n\n\n

    Adhesion Promoting Varnish <\/strong>can be applied to \ndocuments that have an element of personalisation printed. The purpose \nof the varnish is as the name suggests is to aid the adhesion of toner \nto the substrate. Another feature of this product is that it can only be\n viewed using a UV light and if the toner has been removed or altered \nthere is an apparent colour difference.<\/p>\n\n\n\n

    Fugitive inks (aqua) <\/strong>have been developed to protect\n products against fraudsters trying to tamper with documents with the \nuse of water or water based solutions. Any bid to remove with water will\n cause this ink to run or blot giving anyone who is verifying a chance \nof identifying a forgery. There is also availability of a solvent \nsensitive & water sensitive ink that combines both ink \ncharacteristics.<\/p>\n\n\n\n

    \n ANTI-STOKES INK\n<\/p>\n\n\n\n

    An ink which contains crystals of rare-earth metals (ytterbium, thulium, etc.) and glows when exposed to IR light of high intensity. Luminophores which glow green are the most commonly used.<\/p>\n\n\n\n

    Security\n features printed using inks with anti-Stokes properties, often referred\n to as up-converting inks, are invisible to the naked eye and can only \nbe visualised under high intensity IR illumination that causes them to \nemit a visible colour emission.<\/strong><\/p>\n\n\n\n

    Used\n on a variety of high security documents including high denomination \nbanknotes, travels documents and pharmaceutical labels, anti-Stokes \nsecurity inks are manufactured using luminsecent materials containing \nrare-earth metals.<\/p>\n\n\n\n

    Blind Inks<\/p>\n\n\n\n

    Blind inks are inks which have visually the same red colour, but \none of those two inks will appear under a red filter, whilst the second \none will disappear.<\/p>\n\n\n\n

    This is used for obtaining the apparition on a text and to establish its authenticity.<\/p>\n\n\n\n

    On the left side: with the red filter. On the right side, without the red filter.<\/p>\n\n\n\n

    \"\"\/<\/figure>\n\n\n\n
    \"\"\/<\/figure>\n\n\n\n

    Numbering inks<\/h2>\n\n\n\n

    Numbering inks are mainly used by letterpress for the numbering of\n various security documents. Consequently their viscosity is suitable \nfor this type of printing process.<\/p>\n\n\n\n

    They all have a verygood light fastnes of 7 on the blue wool scale.<\/p>\n\n\n\n

    In addition to their visible colours, they can be:<\/p>\n\n\n\n

    \u2013 fluorescent in green, yellow, or red<\/p>\n\n\n\n

    \u2013 migranting in red or pink<\/p>\n\n\n\n

    \u2013 they can be used on papers of 90gsm maximum, but not a coated paper, nor on plastic, nor on metallised supports.<\/p>\n\n\n\n

    Bip-Pen inks<\/h2>\n\n\n\n

    This family of inks, always of black colour, is used for printing security documents.<\/p>\n\n\n\n

    By using specific pigments which give a conductiblilty to those inks,\n and therefore to the printed area, authentification of the document is \nmade by using a special Bip-Pen which will emit immediately a green \nlight if the document is the original, or a red light if the document is\n not the oiriginal. The Bip-Pen is sold by Petrel.<\/p>\n\n\n\n

    Those inks can be printed in offset, water-based or solvent based \nflexography, solvent-based silk-screen, and have only a black colour.<\/p>\n\n\n\n

    Coin reveal-able inks<\/h2>\n\n\n\n

    Coin revealble inks are often used in security for obtaining the \napparition of a hidden message on the original document, and sometimes \nin Direct marketing.<\/p>\n\n\n\n

    After printing and drying, this ink is totally invisible, but it is \nrevealed by using a simple coin, (preferably made of copper or brass) \nrubbed on the printed area. Then the print will appear irreversibly in \ngrey.<\/p>\n\n\n\n

    Coin revealable inks exist for offset, letterpress and flexography.<\/p>\n","protected":false},"excerpt":{"rendered":"

    What types of security inks are there? Security inks are available to protect printed materials in different guises. Invisible Ink One of the most widely used inks is invisible ultra violet and will be revealed when the print is placed under a black lamp (or UV light source). The ink […]<\/p>\n","protected":false},"author":1,"featured_media":466,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-220","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/dns-iran.com\/index.php\/wp-json\/wp\/v2\/pages\/220","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dns-iran.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/dns-iran.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/dns-iran.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dns-iran.com\/index.php\/wp-json\/wp\/v2\/comments?post=220"}],"version-history":[{"count":4,"href":"https:\/\/dns-iran.com\/index.php\/wp-json\/wp\/v2\/pages\/220\/revisions"}],"predecessor-version":[{"id":1598,"href":"https:\/\/dns-iran.com\/index.php\/wp-json\/wp\/v2\/pages\/220\/revisions\/1598"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dns-iran.com\/index.php\/wp-json\/wp\/v2\/media\/466"}],"wp:attachment":[{"href":"https:\/\/dns-iran.com\/index.php\/wp-json\/wp\/v2\/media?parent=220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}