This is a two part test to determine whether a surface has been exposed to a discharged firearm. A rapid color change takes place to verify the presence of nitrates and lead in this gun shot residue test kit. Each kit contains instructions and enough materials for 30 tests for gun shot residue.

Kit Includes:

• 1 x 5 ml Diphenylamine Sulfuric Acid Solution UN1830
• 1 x 0.025 g Sodium Rhodizonate
• 1 x 5 ml Lead Nitrate, 0.05M Aqueous Solution
• 20 Alcohol Swabs

The Gun Shot Residue Presumptive test kit is a great tool for any forensics biology/chemistry lesson.