On some aspects of detecting traces of human skin on porous surfaces

During the study of fingerprint examination objects, the forensic expert selects methods and means with which he identifies and examines traces. Since most of the known forensics have an influence on the tracer substance, which in turn is multicomponent, the expert should clearly represent the mechanism of the ongoing processes in the tracer zone. In forensic work, methods and methods are widely described that allow you to work with the most common objects. Most of this information is organized in the form of practical recommendations. However, in the field of fingerprinting and research, theoretical questions regarding the detection of hand marks using chemical methods are still not clearly described. The article provides theoretical information regarding the laws of the mechanism of trace formation on porous (paper) objects, the mechanism of the chemical reaction of the interaction of ninhydrin and its structural analogues with the disturbed substance of the trace. It was concluded that when choosing methods for detecting latent traces of hands on porous objects, it is necessary to take into account not only the mechanisms of trace formation on porous (paper) objects, but also the mechanisms of the chemical reaction of the interaction of ninhydrin and its structural analogues with the trail disturbed substance.