gunshot discharge residue

gunshot discharge residue

A general term for traces of metals (barium, antimony and lead from the primer of the cartridge) that may be found on the back of the firing hand of a person who discharged a firearm.

Retrieval
Cotton swabs moistened with either 10% hydrochloric acid or 5% nitric acid recover residues for analysis by flameless atomic absorption spectrometry (FAAS) and neutron activation analysis (NAA). Adhesive material is used to recover residues for analysis by scanning electron microscopy and EDAX.