ИСТИНА

In the judicial-investigative practice, it is often necessary to establish the time of the document’s production as a whole or its parts. Solving this problem ultimately allows to find out the authenticity or counterfeit of the document. In these purposes the law enforcement agencies, which appoint expert examination, raise the following questions before expert: how old is a document; when handwritten text, signatures, prints of seals or stamps were inserted in document; when document is made and by what device; what is the sequence of plotting of document’s requisites? Determination of document age is a difficult task of expert research due to the lack of a single universal method and scientifically based methodology. Therefore, solving this problem, the results of author-based, handwritten, technical and forensic examinations of documents using physical, physical-chemical and chemical research methods are used. Also in judicial practice is not uncommon the problem of document falsification. Therefore, the question of studying the processes occurring during the artificial aging of document materials remains relevant. Thus, it is necessary to check the changes in the qualitative and quantitative values of the aging markers over time artificial impact on the document. We carried out comparative analyses of the kinetics of dye degradation processes depending on the different types of external effects on the document - ultraviolet radiation and the effects of high temperatures. A comparison was also made of the results obtained after intentional exposure with the data obtained after the natural storage of documents. This work was supported by the Russian Foundation for Basic Research (Grant No. 17-03-00369) for Lomonosov Moscow State University.