The fight against document forgery advances with 3D micro-profilometry. A new forensic technique analyzes the micrometric relief of inks in passports, making it possible not only to detect forgery but also to identify the specific press used. This method surpasses traditional visual analysis, offering quantifiable, high-precision evidence for document examination. 🔬
Forensic surface analysis: Keyence and GOM Inspect 🖨️
The forensic process begins with scanning the ink surface using a Keyence confocal microscope, which captures micrometric height data. The VK Analyzer software processes these point clouds to generate a 3D profile of the relief. Subsequently, GOM Inspect enables metrological inspection, comparing the ink deformation pattern (such as pressure distribution and layer thickness) against a database of known presses. This surface analysis reveals unique mechanical signatures, such as roller texture or head pressure, which act as a fingerprint of the printing device.
Evidentiary value and future of document examination ⚖️
Unlike traditional methods that rely on subjective observation of ink edges or bleeding, 3D micro-profilometry offers objective and repeatable data. The micrometric relief constitutes solid expert evidence in court, as it directly links the forged document to a specific piece of equipment. This advance redefines the forensic pipeline, moving it away from speculation and closer to materials science applied to security.
Is it possible to identify the specific model of press used in the forgery by analyzing the micrometric marks left on the passport substrate?
(PS: In the forensic pipeline, the most important thing is not to mix the evidence with the reference models... or you'll end up with a ghost at the scene.)