Marquis reagent
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The Marquis reagent is used as a simple spot-test to identify alkaloids. It is composed of a mixture of formaldehyde and concentrated sulfuric acid which is dripped onto the substance being tested. Different alkaloids produce different colour reactions.
It is the primary presumptive test used in Ecstasy testing kits.
It can also be used to test for such substances as cocaine, methadone, hallucinogens, amphetamines and opiates.
External links
- Shulgin on the Test (http://www.cognitiveliberty.org/shulgin/adsarchive/marquis.htm)