Gunshot residue (GSR) refers to tiny particles that are expelled when a firearm is discharged. These particles can come from the primer, propellant, and bullet itself. GSR can settle on the hands, clothing, or nearby surfaces of individuals who have fired a gun or been in close proximity to a shooting incident. Detecting GSR is important in forensic science, as it can help determine whether a person has recently handled a firearm. Various methods, such as scanning electron microscopy and chemical tests, are used to analyze samples for the presence of these residues, aiding in criminal investigations.