MARQUIS Reagent Multi-Use Test Kit


Discreet packaging.

SAME DAY shipping for all orders paid until 22:00 GMT.

  • 1 Bottle of MARQUIS reagent (100-200 uses) 
  • 2 Gloves, 1 micro spatula
  • 1 Double Ceramic Spotting Plate
  • Instructions for use (for 550+ substances)
  • Acid neutralizer (baking soda)

*Refill = only the bottle

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Marquis reagent is one of the primary tests for MDMA/MDA (Ecstasy), meth/amphetamine, cocaine, opioids, tryptamines, and phenethylamines. It is the most popular reagent test Marquis Reagent SIN Test Kit comes with instructions and apps for over 550 substances. Every bottle contains 5 or 10 ml, with each 1 drop accounting for 1 use, 100-200 total. Brown amber glass protects reagents from light, plastic, and moisture to ensure prolonged shelf life. Special high-quality HDPE dropper guarantees 0 spills.

The Marquis reagent is a mixture of sulphuric acid and formaldehyde. On its own it is colorless. It’s best to use Marquis reagent to test MDMA, MDA, 2C-B, cocaine, meth/amphetamine, or opioids, but it’s also a good test for benzofurans, cathinones, tryptamines, and phenethylamines.

NOTE: Marquis reagent turns dark with time, especially if exposed to sunlight or not refrigerated. If you are uncertain whether the reagent will work, test it with a previously checked sample.

Common Marquis color reactions:

  • 2C-B – yellow to green (needs Robadope test)
  • DMT – orange (needs tests Ehrlich and Hofmann)
  • DOC / DOI – green (needs Robadope test)
  • DXM – slow grey to black
  • MDMA / MDA – immediate violet to black (needs tests Simon’s and/or Robadope)
  • MDPV and more cathinones – yellow (needs tests Zimmermann and/or Simon’s)
  • Meth/amphetamine – orange (needs tests Simon’s and/or Robadope)
  • Codeine / Morphine / Heroin – purple


Marquis reagent consists mostly of concentrated acid and is strong enough to burn skin and clothing. Keep out of eyes and mouth. Keep away from children. Always use in a well-ventilated area. Wear gloves (supplied) when handling the bottle and cap. Wear protective eyewear. Never point towards face etc. If you get some on you/clothing, then immediately wash with soap and water. Wash testing surfaces with soap and water as well. Dispose of any unwanted reagent down the sink with running water and baking soda (supplied), ventilate. Store all testing kits away from any heat in a cool, dark place between uses. The average shelf life of 1 year can be significantly extended by storing in a freezer (warm to room temperature before use).

A positive or negative reaction for a substance does not indicate if it is safe. No substance is 100% safe.

Additional information

Bottle Sizes

5ml (~100 tests), 10ml (~200 tests), Refill 5ml (No Kit), Refill 10ml (No Kit)


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