Electron microscopic characterization of hair damage caused by objects of varying severity

II (Japan) and describes sample preparation method. As part of the experimental study, damage was caused by blades with varying degrees of bluntness: sharp (up to 2-25 microns), medium sharp (up to 26-40 microns), blunt (up to 41-50 microns) and severely blunt (over 51-60 microns). According to the results of the research, specific signs characteristic of each sharpness level of the traumatic object have been established, which is illustrated by microphotographs. A subgroup of ideally sharp objects with a sharpness of 1-3 microns has been identified, which form a rather specific morphological picture of the cut. It differs from other sharp objects, and an algorithm for determining the level of sharpness of the trace-forming object has been developed.