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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.Part A - 1 5 ml Diphenylamine Sulfuric Acid Solution UN1830Part B - 1 5 ml Sodium Rhodizonate, 0.5% Aqueous SolutionPart C - 1 5 ml Lead Nitrate, 0.05M Solution20 Alcohol Swabs Contains instructions and enough materials for 30 tests.