Examining the security features on checks

In this thesis, both previously used and currently valid checks issued by banks in Turkey were collected and examined. The study identified the changes made in the security features of these checks over the years, assessed compliance with the standards set by the Central Bank, and detected production defects occurring during the manufacturing process of the checks. In addition, the study investigates which types of security features would benefit banks to implement to standardize the existing features on checks, identify their strengths and weaknesses, and prevent or minimize the production of counterfeit checks both now and in the future. The sample of the study consists of 953 check specimens obtained from 43 domestic and foreign banks operating in Turkey. These checks were categorized into 141 groups based on their production dates and examined in terms of their security features, including UV light, holograms, watermarks, MICR (Magnetic Ink Character Recognition), security fibers, microtext, printing quality, and dimensional properties. A total of 953 check samples from 43 banks were collected during the research process, and all security features were comprehensively documented through visual examination. The study identified changes made to the security features over time. Among the added features observed from past to present, MICR, UV-sensitive images, security fibers, holograms, and microtext stand out as proactive measures against counterfeiting. However, dynamic features such as thermochromic ink and pantographic images are not used on checks issued in Turkey. Among the 141 groups analyzed, it is noteworthy that microtext, considered a significant security feature, was preferred by banks in only 56 groups, making it the least utilized feature. Additionally, the MICR feature showed variations in 133 groups, making it the most inconsistently applied feature, which is another notable finding of the study. During the production of checks, security features that do not comply with the standards set by the Central Bank were identified, along with production defects introduced at the manufacturing stage. The lack of adherence to Central Bank standards and the presence of production errors have been found to negatively affect forensic examinations and legal proceedings. As a result, an increase over the past five years in the number of dishonored checks, cases under the Check Law, and forgery cases, recorded by the Istanbul Gendarmerie Forensic Laboratory, were observed. These findings highlight the need for the Central Bank to establish updated standards and emphasize the importance of banks and production facilities complying with these new regulations. It is essential to adopt updated versions of existing security features to prevent counterfeiting and to facilitate the identification of forged checks. Enhancements such as using three- or four-colored security fibers instead of single-colored ones, applying UV-sensitive features similar to those used in passports with overlapping multi-color transitions, employing complex patterns instead of solid colors in printing techniques, embedding microtext within print designs, and standardizing MICR dimensions with appropriate shading are among the recommended improvements. Additionally, implementing three-dimensional holograms with parallax effects, integrating them into the paper pulp during production, and utilizing watermarks—preferably in advanced forms such as micro-watermarks—can significantly strengthen proactive counterfeit prevention. Furthermore, incorporating dynamic features that are currently not used in Turkish checks, such as thermochromic ink and pantographic patterns—technologies already adopted in countries like India, Dubai, and Canada—would contribute to more effective fraud prevention. Failure to implement such measures may hinder the ability to curb the rising trend of check fraud, complicate forensic examination processes, and negatively impact judicial proceedings. Keywords: Bank checks, forgery, security features, UV light, hologram, watermark, MICR, capillary fiber, micro writing, printing and size.