How to do a Marquis Drug Test

This entry is part 4 of 8 in the series Psychoactive Self-sufficiency

Marquis drug test reagent

First discovered in 1896, by Eduard Marquis, Marquis reagent is commonly used as a simple spot-test to presumptively identify Ecstasy, as well as other substances, including opiates and phenethylamines. A drop or two of Marquis (which is initially clear and colorless) is added to a small amount of the test substance, and the resulting colour change and its duration compared to a reference chart of known colour reactions. Different compounds produce different colour reactions.

Performing a Marquis Drug Test

Marquis reagent is a mix of sulphuric acid and formaldehyde, and therefore highly toxic, strongly corrosive, and possibly carcinogenic. Marquis can be absorbed through the skin, and should only be stored in glass or porcelain containers.

  1. Put a drop of reagent on a glass or porcelain surface.
  2. Take a small sample of the substance and add it to the reagent.
  3. Immediately compare the resulting colour change to the references below. No colour change after one minute should be taken as a sign of the presence of one or more unknown substances.
Click to enlarge

Click to enlarge

Marquis Reagent Colour Results

Substance

βk-2C-B
2C-B
2C-I
DOB
2-FMA
25I-NBOMe
25C-NBOMe
25B-NBOMe
5-EAPB
5-MeO-MiPT
Aspirin
Adrafinil
Benzphetamine HCl
Benzylpiperazine (BZP)
Butylone
Chlorpromazine HCl
Codeine
Caffeine
Cocaine
d-Amphetamine HCl
d-Methamphetamine HCl
Diacetylmorphine HCl (Heroin)
Dimethylamylamine (DMAA)
Dimethyltryptamine (DMT)
Dimethoxy-meth
Doxepin HCl
Dristan
Exedrine
LSD
Methoxetamine
MDA
MDEA
MDMA
MDPR
Methylone (M1/bk-MDMA/MDMC)
Methylenedioxypyrovalerone (MDPV)
Pethidine/Meperidine HCl
Mescaline HCl
Methadone HCl
Methylphenidate HCl
Methylene Blue
Modafinil
Morphine monohydrate
Opium
Oxycodone HCl
Propoxyphene HCl
Sugar

Colour

Bright orange
Green to yellow
Green to yellow
Olive green to yellow
Colourless to light yellow
Orange
Clear (no change)
Dark green
Purple to black
Clear to light brown
Pink to deep red
Deep reddish orange to brown
Deep reddish brown
Clear (fizzes)
Yellow
Deep purplish red
Very dark purple
Clear (no change)
Clear (no change)
Strong reddish orange to brown
Deep reddish orange to brown
Deep purplish red
Clear (fizzes)
Orange
Moderate olive
Blackish red
Dark grayish red
Dark red
Olive black
Slow pink
Dark purple to black
Dark purple to black
Dark purple to black
Dark purple to black
Yellow
Yellow
Deep brown
Strong orange
Light yellowish pink
Moderate orange yellow
Blue to dark green
Yellow to Orange to brown
Deep purplish red
Dark grayish reddish brown
Pale violet
Blackish purple
Dark brown

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