Studying of handwritten strokes aging kinetics by high-performance liquid chromatography/mass spectrometry
T15N4
D.I. Baygildieva, , T.M. Baygildiev, О.A. Shpigun, I.A. Rodin
One of the central problems of documents forensic examination is the determination of the ink deposition date by such common writing instruments as ballpoint pens. To solve this problem, it is necessary to get information about the composition of ballpoint pen inks that were used for depositing inks, to get information about qualitative and quantitative changes of components undergoing in time after depositing inks on a document, as well as to know changes in the composition and properties of the ink caused by environmental influences or intentional effects on document such as photo-, thermal-, UV-, IR-radiations, microwave and other types of external influences.
Therefore, the purpose of this research was to develop an approach that allows one to detect changes and establish dependence of these changes in the ballpoint pen composition that occur in strokes over time. As a result of this study, the possibilities of liquid chromatography/mass spectrometry for the detection of changes over time in the composition of ballpoint pen inks BIC Original, Corvina 51 and Pilot were estimated. Modeling of the dyes degradation under the influence of UV radiation on strokes was carried out. Kinetic parameters that describe the degree of dyes conversion were determined.
