Application of molecular absorption spectroscopy analysis in forensic document assessment

Abstract

   Cases related to forged documents are increasingly common with sophisticated and complex. In which documents related to handwriting, signature often appear in criminal cases and civil disputes. Most current handwritten documents often use ballpoint pens, so analyzing ballpoint pen ink samples on the market is an important basis for criminal investigation of forged documents. This paper presents a way to distinguish the inks of Thien Long ballpoint pen samples by ultraviolet-visible (UV-Vis) molecular absorption spectroscopy with three samples: matixs, flexoffice and TL-023; by IR spectroscopy with six blue samples: grip, matixs, executive, flexoffice, leger, TL-023 and 06 black samples: grip black, matixs black, executive black, flexoffice black, leger black, TL-023 black. The obtained results show that the pattern analysis by UV-Vis method gives faster and easier to distinguish results than the IR analysis method.