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Marquis reagent

A presumptive drug test reagent consisting of formaldehyde in concentrated sulphuric acid, first described by Edmund Marquis in 1896. It produces characteristic colours with aromatic amines and opioid alkaloids through electrophilic aromatic substitution and oxidative cyclisation reactions.

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Related terms

6-monoacetylmorphine (6-MAM)Duquenois-Levine test4-Anilinopiperidine scaffoldAlkaloid ratio profilingBenzoylecgonineCarfentanilCobalt thiocyanateDiacetylmorphineDose heterogeneityFalse positive (presumptive test)Mandelin reagentMecke reagent

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