Specifically designed for quick, easy, effective field testing of gunshot powder residue. This field test kit is for the detection of nitrite containing residues typical to gun powder residues. Tests for gunshot powder residue. GSPR can detect limited types of primer residues. Primer components such as lead styphnate (used less and less) and barium nitrate can be detected by the product. Antimony sulfide cannot be detected, and GSPR cannot detect stabilizer components like diphenylamine KIT CONTAINS: 3) 100 ml aerosol GSPR sprays 25) GSPR mittens