Question: what is the chemical composition of gsr?
Answer: Gunshot Residue. GSR consists of unburned or partially burned gunpowder particles, soot, nitrate, and nitrites from the combustion of the powder, particles of primer (oxides of lead, antimony, and barium), and particles of the bullet or the bullet jacket that are vaporized when a firearm is discharged (Rowe, 2000).