Duquenois-Levine test

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A widely used presumptive test for tetrahydrocannabinol and other cannabinoids. The Duquenois-Levine reagent has a solution containing 2% vanillin and 1% ethanal. Concentrated hydrochloric acid is added and then chloroform. A purple colour in the chloroform layer indicates a positive result.

Subjects: Chemistry.

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