ИСТИНА

One of the central problem of the documents forensic investigation is the setting the time and sequence of production of document details including chronological sequence of intersecting strokes and time interval and sequence of execution of document copies. As a rule, the writing down of signatures or any handwritten notes are carried out by ballpoint pens with blue color inks, in connection with it, researches are mainly focused on the study of this type of pen inks. However, different modern physical and chemical methods do not always solve the problem of interpreting the obtained results due to the complexity of the analyzed objects, as well as the influence of external parameters on degradation processes To solve the problem of determination of records aging made by ballpoint pens, it is necessary to get information about the composition of ballpoint pen inks, and about qualitative and quantitative changes of some components that may occur during aging. Moreover, it is necessary to know the laws of the features formation due to the paste production process, temporary changes in the composition and properties of paste from the moment of applying the stroke, changes in the composition and properties of paste caused by environmental influences or caused by intentional effects on document such as photo-, thermo-, UV-, IR-, microwave and other types of external influences. The study of artificial aging processes of dyes in the ink strokes of ballpoint pens BIC Original, Corvina 51 and Pilot BPS exposed to the thermal effect was carried out. As the exposure time of the thermal effect increased, a visible change of degradation products content relative to the initial dye was observed. The kinetic characteristics of dyes degradation processes have been revealed, which make it possible to predict the characteristic correlations of the dyes and their degradation products content.