fifthgrouptwo


 * //W//hen the firing pin of a firearm strikes the primer of a cartridge the //primer compound// ignites sending a flame into the cartridge case. //Gunpowder// in the cartridge case starts to burn, causing it to change from a solid material to a gas. This change creates pressure within the cartridge, which in turn forces the bullet down the barrel and down range. Pressure building behind the bullet is released when the bullet exits the muzzle of the firearm.**

The further gunshot residues travel from the muzzle, the broader and less concentrated the pattern becomes. Because the various elements included in gunshot residues are very small and lack mass they lose their energy rapidly. Gunshot residues can also be emitted from other areas of a firearm. As you can see in the above image, gunshot residue is escaping from the barrel/cylinder gap of the revolver.

gunpowder residue on skingunpowder residue on skin with hair in the way