Gun Shot Residue 
suitable for KS3+. This is a two-part test to determine whether a surface has been exposed to a discharged firearm. A rapid colour change takes place to verify the presence of nitrates and lead. Each kit contains instructions and enough materials for 30 tests. Materials included in the kit: 1 Diphenylamine Sulfuric Acid Solution, 5 ml 1 Sodium Rhodizonate, 0.025g 1 Lead Nitrate, 5ml 1 Aqueous Solution, 0.05M 20 Alcohol Swabs.