This presumptive test is designed to identify THC in Marijuana. This original chemistry was the foundation for the three ampoule Duquenois-Levine (more specific) but is recognized as an excellent test for THC. The 1st ampoule should be agitated for sixty (60) seconds. No color should develop (THC is a clear colored substance). If a color does develop, you may have a false positive. The 2nd ampoule with show a very fleeting flash Green color before developing a definitive midrange Purple. Like all our NARK narcotic field tests, the Mayers Reagent is meant for presumptive field drug testing. 10 test/box.

Like all our NARK narcotic field tests, the Duquenois Reagent is meant for presumptive field drug testing.

NOTE: ALL TEST RESULTS MUST BE CONFIRMED BY AN APPROVED ANALYTICAL LABORATORY! The results of this test are merely presumptive. NARK® only tests for the possible presence of certain chemical compounds. Reactions may occur with, and such compounds can be found in, both legal and illegal products. This test must be administered following its specific instructions and may be used in conjunction with other reagents in the NARK® II Sequential Testing System.

NARK—Storage and Handling

Storage:

• Avoid UV light (sun, fluorescent lighting)
• Avoid extreme heat or cold
• BEST: Keep in original package/box in cool, dry environment
• Shelf Life: Best if used within 3 years