MARQUIS Reagent Test Kit

(9 customer reviews)


Discreet packaging, with no mention of “SIN”.
SAME DAY shipping for all purchases before 11 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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By purchasing the SIN Marquis Reagent Test Kit you support our fight for drug policy based on harm reduction, human rights, and facts, not prejudice.



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. SIN Marquis Reagent 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.

Are you still looking for the best reagent test kit? See more HERE.




NOTE: Marquis can only test the PRESENCE, not PURITY or QUANTITY of a specific substance.
Always test under a strong light and using the smallest possible sample. Never open more than 1 bottle at once, if you make a mistake you might contaminate the reagents and spoil them. If a few reactions are happening at once, only the darkest one of them will be visible. To detect adulterants, try using on fresh samples secondary reagent tests like RobadopeSimon’s, Scott or Zimmermann. If you don’t know yet how to use Marquis reagent, see the following instructions:

  1. On a clean ceramic surface (e.g. bottom of a mug or a plate) prepare a sample no bigger than this size -> ●
  2. Carefully not to touch the sample with the bottle, remove the cap, twist the bottle upside-down and wait for 1 drop to fall. Replace the cap.
  3. Immediately observe the color change and compare it with the Marquis color chart. No reaction within the first 30 seconds or unexpected results indicate the sample doesn’t contain the expected substance or is adulterated.
  4. Neutralize the reaction with baking soda (optional) and flush in a sink under running water for a few minutes.

No reaction can be caused by PMA/PMMA, mephedrone, cocaine, caffeine and other substances (or lack of active ingredient).


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

Find the best reagent test kits HERE.




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

Weight 0.28 kg

Refill 5ml (~100 tests), Refill 10ml (~200 tests), Kit 5ml (~100 tests), Kit 10ml (~200 tests)


5ml (~100 tests), 10ml (~200 tests)

Shelf life in the fridge

12 months +

9 reviews for MARQUIS Reagent Test Kit

  1. eBay Buyer j***4

    Smooth transaction. Pleasure to do business with.

  2. eBay Buyer h***1


  3. eBay Buyer m***6


  4. eBay Buyer i***h

    alles top, gerne wieder

  5. eBay Buyer m***!


  6. eBay Buyer a***h

    Fast delivery, good item.

  7. wiktor.borzecki

    Przydatny bardzo.

  8. Euforia

    Niezbędnik każdego miłośnika prawdziwej empatii 😉

  9. eBay Buyer t***a

    Very fast postage from Poland to Aus. Genuine product – Very Happy

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