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. ODV 7605 NarcoTest Dille-Koppanyi Reagent (Barbiturates) odv-7605Regular price: $19.99Sale price: $12.95 Copyright 2012 Police Supply Online providing Police Equipment to over 300 Police, Federal & Military Law Enforcement Agencies around the world.