Druckbildprobe

Druckbildprobe is a German term that translates to "print image test" or "ink impression test". It refers to a forensic examination method used to analyze and compare the impressions left by printing devices, such as printers or typewriters, on documents. The purpose of a Druckbildprobe is to determine if a document was produced by a specific printing device, to identify the type of device used, and to potentially establish a link between different documents that share a similar printing origin.

The analysis involves examining various characteristics of the printed impression. These can include the size, shape, and spacing of characters, the presence of specific defects or imperfections on the printing elements (like worn-out keys on a typewriter or minor damage to a printer's font wheel), the way ink or toner is applied, and the overall impression quality. Even subtle variations in the printing process can leave unique, identifiable marks.

In a forensic investigation, a Druckbildprobe is often conducted when there is suspicion of document forgery, plagiarism, or when trying to trace the origin of anonymous communications. By comparing the unknown print impression on a document with known exemplars from suspected printing devices, forensic document examiners can provide expert opinions on the likelihood of a match. This technique is a valuable tool in forensic science for establishing the authenticity and origin of printed materials.