Marquis reagent

Marquis reagent (gives a purple-red coloration, then violet, then blue with morphine, codeine, dionine, and heroine) mix 3 mL of concentrated H2SO4 with 3 drops of a 35% formaldehyde solution. 

Maltodextrin 182 Maltose 164,165, 181-184 Mandelin s reagent 426 Manganese cations 144 Manganese(II) chloride reagent 333 Mannitol 409,410 Marking the front 132 Marmesin 67 Marquis reaction 352 Marquis reagent 299 Matacil 107... 

The Marquis reagent testing kit can be used to test if a pill contains ecstasy or PMA. Fact—The kit produces a dark blue-purple color in the presence of ecstasy and no color change in response to PMA. However some pills containing PMA also contain ecstasy, so a positive result for ecstasy does not mean the pill is free of PMA. 

Method 1. Place a portion of the sample in each of two ignition tubes and to one tube add some solid sodium hydroxide. Heat both tubes carefully, allow water vapour to escape, insert into the vapours in each tube an open capillary tube containing Marquis reagent, and observe the colour of the reagent. 

Marquis reagent. This reagent is preferably poured on to the plate because of the danger of spraying concentrated acid. Black or violet spots are given by alkaloids related to morphine. Many different colours are given with a variety of drugs (see under Colour Tests, p. 139). 

Thin-layer Chromatography. System TA—Rf system TB—Rf 03 system TC—Rf 25. Dragendorffspray, positive FPN reagent, pink acidified iodoplatinate solution, positive Marquis reagent, orange.)... 

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