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The ODV NarcoPouch Dille-Koppanyi Reagent (Barbiturates, 10 Pack) is presumptive test designed to identify a Barbiturate in either a tablet or capsule form. To test tablets, reduce the substance to a powder form. For capsules, open the capsule and remove a small amount of the powder. Place a small amount in the field test. A Lavender color will develop in the presence of Barbiturates.