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A few remarks about the use of Griess reagent in firearm examinations

The purpose of this article is, inter alia, to determine whether it is possible to define the time that has elapsed since the last shot from a firearm, based on chemical tests of the post-firing residue remaining in the interior of the gun barrel after combustion of gunpowder and firing the primer mass, using Griess reagent. The article also presents the firearm examination findings related to the use of Griess reagent, including the risk of falsification of the results due to previous use of red fluorescent dye in dactyloscopic firearm examinations.