turvatrüki

Turvatrükk, often translated as security printing, refers to the specialized printing techniques used to prevent counterfeiting of documents, currency, and other high-value items. It involves incorporating a variety of security features that are difficult to replicate without specialized knowledge and equipment. These features can be overt, meaning they are easily visible to the naked eye, or covert, requiring specialized tools for detection.

Common overt security features include watermarks, which are variations in paper thickness that create a visible image when held up to light. Microprinting, tiny text that is often illegible without magnification, is another common technique. Holograms, iridescent inks that change color depending on the viewing angle, and raised printing, which creates a tactile effect, are also frequently employed. Special inks, such as UV-reactive inks that are invisible in normal light but glow under ultraviolet illumination, or thermochromic inks that change color when heated, add further layers of security.

Covert security features are designed to be invisible or difficult to detect without specific knowledge or tools. These can include special chemical markers embedded in the paper or ink, or intricate patterns that are only visible under specific lighting conditions or with special viewers. The combination of multiple security features, both overt and covert, creates a robust defense against counterfeiting, making it significantly harder for counterfeiters to produce convincing replicas. Turvatrükk is crucial for maintaining the integrity of financial instruments, identity documents, and other items where authenticity is paramount.