Reagent Reaction Guide
How to Test Cocaine with Marquis Reagent
Marquis reagent is a general-purpose screening reagent that reacts with MDMA, amphetamines, opioids, and 2C-B. It is the most commonly used drug checking reagent and should be your first test for any unknown substance.
Expected Result
No reaction
Reaction speed: Immediate (under 5 seconds)
ℹ️ No reaction is itself useful information — it rules out substances that DO react with this reagent.
How to Test
- 1Place a small sample (match-head sized) on a clean white ceramic testing plate.
- 2Add 1-2 drops of Marquis reagent to the sample.
- 3Observe the color change within 30 seconds. Note both the initial color and any changes.
- 4Compare your result to the expected color above. Take a photo if you plan to share for verification.
Buy Marquis Reagent
The #1 drug checking reagent. Identifies MDMA, amphetamine, methamphetamine, and opiates in 30 seconds. Includes color chart card, testing surface, and instructions.
$20.00~50 tests per bottle
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Other Reagents for Cocaine
A single reagent test is not enough for definitive identification. Consider adding these to your protocol:
All test kits for Cocaine →What Else Marquis Can Test
See how every reagent reacts with every substance on our full color chart.
Full Reaction Chart