Differentiation of Lead-Free and Lead-Based Primers using Post-Fire Priming Cup Residue

When a weapon is discharged a plume of residue originating from the ammunition settles on the shooter, the victim, and that which is in the vicinity during the shooting. This residue, more commonly referred to as gunshot residue (GSR), is traditionally identified based on the presence of lead (Pb), barium (Ba), and antimony (Sb). It is often used in criminal cases as a method of identifying a shooter or estimating a shooting distance, which may assist in the discrimination between hypotheses (i.e.

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