UDC 343.982.347
Based on the experiment, it is shown how the use of expert light contributes to the detection and examination of hand (foot) marks on various surfaces. An important role in the qualitative visualization of trace information on surfaces, as well as in its image in the photo, is assigned to filters, in particular, the yellow filter as one of the most effective means of technical trace fixation. The results of the experiment showed that the clearest photographs of handprints are obtained in the blue light spectrum in combination with this filter (provided that the traces are detected by fluorescent powders). Photofixation of such traces is carried out without distortion due to the “glow” of the trace, which provides complete visualization over its entire area. The latter circumstance makes it possible to carry out a fingerprint examination of the photo image in the future, even if the trace is physically lost for some reason.
expert light, trace, forensic tool, crime scene investigation, filters, trace carrier material
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