Presumptive test designed to identify the presence of Methamphetamine and MDMA (Ecstasy). Upon breakage of all ampoules and agitation, a Dark Blue color confirms the presence of a secondary amine (Methamphetamine or Ecstasy). You can differentiate these substances by using the Marquis Reagent #902 in conjunction with the Sodium Nitroprusside Reagent #923. 923 NarcoPouch Sodium Nitroprusside Reagent (Methamphetamine) odv-900Regular price: $29.99Sale price: $21.30 Copyright 2012 Police Supply Online providing Police Equipment to over 300 Police, Federal & Military Law Enforcement Agencies around the world.