Reagent for detecting traces of blood "Pathfinder - S"
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The Pathfinder-S reagent is an aqueous suspension. The solution is applied to the suspected location of blood traces. Invisible traces (not distinguishable against the background, removed by scraping, washing, or located in cracks and seams) are revealed in a darkened room by spraying the prepared solution. As a result of the solution's effect on the blood substance, a bluish glow occurs, lasting about one minute, and resumes after repeated spraying. This phenomenon is called chemiluminescence, does not require an external source of excitation and occurs only due to the energy released during chemical processes. To enhance the luminescence of blood traces treated with the reagent, an ultraviolet light source is used.
It is worth noting that this method makes it possible to detect even the smallest traces of blood. The reaction to the reagent treatment retains its sensitivity even after attempts to remove blood (scraping, washing with soap or washing powders, dry cleaning, ironing with a hot iron) on almost any material, since it is almost impossible to completely remove traces of blood. The exception is cases of careful removal of blood from smooth non-absorbent surfaces (e.g. plastic).
The use of the reagent "Sledopyt-S" takes place in cases where the fact of a crime is known (murder, knife wounds, gunshot wounds, etc.), but the criminal tried to destroy traces of the crime, and in this case the reagent will help forensic scientists and investigators to detect invisible (destroyed) traces of blood.
The effect of the reagent on traces does not interfere with the subsequent forensic examination of traces of blood.
Delivery set:
Hand sprayer capacity 0.25 l - 1 pc. Dry mix for preparing ready-made solution – 4 bottles Liquid for diluting the solution – 4 bottles. Disposable gloves – 4 pairs Instructions for using the reagent Using Sledopyt-S
https://rutube.ru/video/dc36a4075b3e89a2f22a913318ff6794/ In addition to this reagent for searching for invisible traces of blood, the reagent of the "MDR" brand (MDR-Ch and MDR-B), designed to detect invisible fingerprints on wet surfaces, will be useful. In combination with classical methods of detecting traces (fingerprint powders), the productivity of searching for invisible fingerprints at the scene of the crime increases several times, which has a beneficial effect on the detection of crimes.
The use of this method of detecting traces of blood has been known to the world for over 80 years. This method of detecting the presence of blood using a composition of this type was proposed as an auxiliary tool for detecting invisible traces of blood in forensic and judicial investigations.
"Thus, in 1937, Specht, W. in the article "The Chemoluminescence of hemin: an aid for finding and recording blood stains important for forensic purposes", Angemande Chemie, 10, 155-157, was the first to propose using the detection of the presence of blood at a crime scene as evidence in forensic and judicial investigations, using a similar composition"
"In 1937, Specht, W. in the article "The Chemoluminescence of hemin: an aid for finding and recording blood stains important for forensic purposes", Angemande Chemie, 10, 155-157, studied and demonstrated the sensitivity of the luminescent reaction with this reagent on traces of dry blood diluted in a volume ratio of 1:2000".
"In 1939 Proescher, F. & Moody, A.M. in their article "Detection of blood by means of chemiluminescence". Journal of Laboratory Clinical Medicine, 24, 1183-1189, mentioned that Specht, W., in 1937 in his article "The Chemoluminescence of hemin: an aid for finding and recording blood stains important for forensic purposes", Angemande Chemie, 10, 155-157, reported tests carried out in bushes and shrubs on blood exposed to sun and rain, and showed that under these various conditions a chemiluminescent reaction took place." "As for their own research, they tested the composition proposed in the article Specht, W., 1937, "The Chemoluminescence of hemin: an aid for finding and recording blood stains important for forensic purposes", Angemande Chemie, 10, 155-157, on both animal and human blood diluted in a ratio of 1:1,000,000, and showed that a chemiluminescent reaction took place in both cases." https://findpatent.ru/patent/232/2322679.html
"It is known from history that back in 1963, the All-Russian Research Institute of Criminalistics of the USSR Prosecutor's Office, signed by V.I. Vinberg, sent an information letter to all prosecutor's offices in the country, in which investigators were guided by the fact that hidden traces revealed with the help of the solution and recorded in the protocol in the presence of witnesses have evidentiary value, i.e. can be considered as traces of blood."