Some possibilities of applying instrumental methods while making forensic-technical expertise of documents made by printing

The paper deals with one of the topical issues related to forensic-technical expertise of documents - possibilities of applying instrumental methods while examining printed products to improve objectivity of the expert's conclusions. The author of the paper notes that the vast majority of expert examinations and studies of the objects in question are carried out without sufficient support for the conclusions. When establishing the difference between the document being examined and the sample that coincide in a printing method; experts, as a rule, deal with the subjective criterion, that is, «inconsistency in print quality», without reflecting its characteristics. Purpose: to study the essence of densitometry with reference to the objects of forensic-technical expertise and to enhance the objectivity and scientific validity of the expert's conclusions based on the results of the examination of printed documents, by measuring the quantity of impressions by densitometry in the reflected light. Methods: the author uses general scientific and special scientific methods - those ones of formal and dialectical logics, analysis and synthesis, description, comparison, generalization of practice. Results: the invention relates to a diagram for using a densitometric method for determining the optical density of the paint layer of the lines of documents' details in order to solve diagnostic problems of the forensic-technical expertise of printed products.