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| security thread | |
|---|---|
| Name | Security thread |
| Introduced | 19th century |
| Used by | Central banks, treasury departments, Bank of England, Federal Reserve System, European Central Bank, Reserve Bank of India |
| Purpose | Counterfeit deterrence, authentication |
security thread A security thread is a narrow strip incorporated into paper-based instruments to deter counterfeiting and enable authentication. It appears in banknotes, passports, identity cards and secure certificates issued by entities such as the United States Department of the Treasury, Bank of England, European Central Bank, Reserve Bank of India and the People's Bank of China. Threads are designed to interact with printing, watermarks, intaglio and optical features used by institutions like the International Monetary Fund and national mints.
Security threads function as embedded or windowed filaments that show visible, metallic or optically variable features under normal view and distinct responses under transmitted light and ultraviolet illumination. Central banks such as the Federal Reserve System, Bank of England and European Central Bank combine threads with hologram stripes, microprinting and specialized inks produced by companies including De La Rue, Giesecke+Devrient and Crane & Co.. Typical deployment spans banknote denominations, passport booklets issued by ministries like the Home Office (United Kingdom), and secure papers used by agencies such as the United States Secret Service.
Early use of embedded metallic strips in secure paper dates to 19th‑century initiatives by private firms and national treasuries following forgery incidents affecting the Bank of England and colonial banks. Development accelerated through the 20th century with contributions from firms like Giesecke+Devrient and De La Rue, and institutional requirements set by organizations such as the BIS and European Central Bank. Technological milestones include the shift from simple metallic foils to microprinted, windowed and optically variable threads during the post‑World War II era and the introduction of threads compatible with polymer banknote substrates used by the Reserve Bank of Australia.
Threads vary by construction and material: metallic strips (aluminum, stainless steel), metallized polymer, microprinted paper threads, and threads incorporating optically variable devices like holography or color shifting ink. Windowed threads alternate exposed and embedded sections as seen in euro banknotes issued by the European Central Bank; fully embedded threads run continuously through paper as in older United States dollar series. Specialized threads include magnetic threads used in systems overseen by central banks like the Bank of Japan, and polymer‑based threads compatible with polymer banknotes issued by the Reserve Bank of Australia.
Manufacturers such as Crane & Co., Giesecke+Devrient, De La Rue and SICPA supply threads tailored to printers operated by national mints like Her Majesty's Stationery Office and the United States Bureau of Engraving and Printing. Integration occurs on paper machines during the sheet formation stage or via post‑formation insertion in windowed formats; processes conform to standards applied by the European Central Bank and overseen in coordination with national treasuries. Threads may be incorporated alongside watermarks, security fibers, intaglio printing plates used by firms such as American Banknote Corporation, and machine‑readable features specified by organizations like the International Civil Aviation Organization for travel documents.
Authentication employs visual inspection (tilt, transmitted light), magnification to reveal microprinting and latent images, ultraviolet lamps used by police forces like the Metropolitan Police Service and customs agencies, and machine readers deployed by banking networks such as the SWIFT community. Forensic laboratories of central banks, including the Federal Reserve System and the Deutsche Bundesbank, use spectrometry and microscopy to analyze thread composition. Automated sorting equipment from manufacturers like Giesecke+Devrient and Glory Global Solutions reads magnetic signatures, optical patterns and infrared responses for high‑throughput authentication in cash handling operations.
Counterfeiters target threads using foil strips, printed imitations, or window overlays; known incidents have prompted upgrades by institutions such as the Bank of England and European Central Bank. Vulnerabilities include delamination, optical mimicry, and successful reproduction of microtext by sophisticated printers. Central banks and security firms respond by developing multi‑feature threads combining holography, machine‑readable magnetic elements and covert markers endorsed by organizations like the International Organization for Standardization and national standards bodies.
Threads appear in passports, national identity cards, driver's license variants issued by agencies such as DVLA (UK), and secure certificates for universities and registries like Companies House. Aviation‑grade travel documents conform to International Civil Aviation Organization specifications often incorporate windowed or embedded threads for cross‑border verification. Beyond documents, threads are used in stamps, stock certificates and high‑value vouchers issued by institutions like the United States Department of the Interior and cultural heritage bodies managing provenance documentation.
Category:Security features