How to test COCAINE?

How to test cocaine: if you intend to use cocaine, first you need a cocaine test kit to check it for adulterants. Pure cocaine is white powder or clear crystals and can’t be identified by appearence. To test cocaine use reagent tests Marquis, Mecke, Liebermann, Ehrlich and Scott in single-use or multiple-use test kits. To detect fentanyl or test for fentanyl analogs it’s recommended to use fentanyl test strips.

Drug tests presumptively indicate PRESENCE, but not PURITY or QUANTITY. Use different tests to improve accuracy and to detect adulterants – 90% of adulterants will react with 1 out of 3 reagents, and 95% with 1 out of 5.

A positive or negative test result does not indicate if the substance is safe. No substance is 100% safe.

TL;DR: Here is an image with a quick cheat sheet how to use the Cocaine Test Kit, or check out more detailed guide on how to test cocaine further below.

How to test cocaine? Cocaine Test Kit Instructions Flowchart
How to test cocaine? Instructions how to use the Cocaine Test Kit with reagent tests Marquis, Mecke, Liebermann, Ehrlich and Scott. Same reagents for testing cocaine as in the guide How to detect levamisole.

What test kit do I need to test cocaine (coke / blow)?

 Cocaineprimary test – Marquis
primary test – Scott
primary test – Liebermann
secondary test – Mecke
secondary test – Ehrlich
recommended test kits:
single-use Cocaine Test Kit
multiple-use Cocaine Test Kit
Levamisoleprimary test – Marquis
secondary test – Liebermann
recommended test kits:
multiple-use Cocaine Test Kit

How can I test cocaine?

BEFORE using a cocaine test kit

  • It’s RECOMMENDED to record the reaction to compare later

STEP ONE for testing cocaine powder / crystals

  • Take and finely crush a small piece, no bigger than a head of a needle – like this •.
  • Put it on a suitable testing plate, preferably a spot test plate or the bottom/underside of a ceramic mug (example). *If using single-use vials insert the sample and observe, as the reagent is already within.
  • Add one (or two) drops of Scott reagent test (or other supplied) on the sample and wait for the results.
  • Check reagent test results in instructions.

How to use a cocaine test kit?

  • Check test results with Scott test kit: if testing cocaine with Scott whole reagent liquid should instantly turn blue, not just the sample.
  • While many substances turn blue with Scott reagent, almost only cocaine, lidocaine and other -caines change color of the reagent liquid itself.

STEP TWO testing cocaine for adulterants  

According to the EMCDDA most common cocaine adulterants are levamisole (animal deworming agent), caffeine, other stimulants and different pharmacuticals like phenacetin or lidocaine.

  • To detect levamisole use reagent tests Marquis and Liebermann. If only Liebermannturns orange, that indicates the presence of levamisole. If Marquis is orange too, that indicates presence of meth/amphetamine.
  • Next try other reagents that that should NOT change color with cocaine: Mecke, Froehde, Robadope (for 2C-x, amphetamine, MDA or PMA), Simon’s (for cathinones, methamphetamine, MDMA or PMMA) or Zimmermann (for a-PVP and 4-MMC derivatives).
  • Keep in mind that various non active cuts can impact the reagent tests results (pink Marquis color change can be normal).
Liebermann reagent detects Levamisole in cocaine
How to test cocaine? How to detect levamisole and other adulterants using MarquisMecke and Liebermann reagent tests, included in the SIN Cocaine Test Kit. This result is inconclusive as indicates presence of phenacetin, levamisole and/or other unidentified active or inactive adulterants.

AFTER using a cocaine test kit

  • OPTIONAL: Pour baking soda over a finished reaction to neutralize used reagents.
  • Wash testing surface under running water.


  • Blue crystals. Many substances turn their crystals or powder blue with Scott reagent, but almost only cocaine, lidocaine or other caines turn the reagent liquid itself blue.
  • Pink Marquis reagent color change can be normal and is thought to be caused by an unknown inactive substance.
  • Fizzing. Any synthetic drug in a form of salt will bubble with most reagent tests, which are strong acids. If you see only fizzing instead of color change, that can indicate presence of a new psychoactive substance.
  • Speed of the reaction does not indicate quantity nor purity. However, if you are having trouble interpreting your result try using a bigger sample or crushing it better before testing.
  • How many tests can you get from one test kit? A multiple-use test kit lasts up to 100 (5 ml) or 200 (10 ml) tests. Each drop equals one test. A single use-test kit contains 2 disposable ampoules (2 tests).

All cocaine test results:

MARQUISNo color change
MECKENo color change
MANDELINShort brown
FROEHDENo color change
EHRLICHNo color change
HOFMANNNo color change
SIMON’SBlue spots
ROBADOPENo reaction
SCOTTFull instant blue color change

Cocaine test did not react as indicated? Watch out!
All test results are available in our instructions and TestDrugs apps.

How to check if reagent for testing cocaine works?

  • Test any substance and compare color reactions with instructions. It’s easiest to use aspirin – Marquis reagent reacts to it with a slow pink or orange color change.
  • Keep a sample to compare later in case of doubt. If control sample reacts fine, it means the reagent still works.

Looking where to buy a kit for testing cocaine?

How can I detect fentanyl?

BEFORE using a fentanyl test strip

  • It’s RECOMMENDED to test each and every dose. Because of extreme potency (microgram range) fentanyl is never evenly mixed in.

STEP ONE for testing fentanyl powder / pills / spice

  • Dissolve 100-200 mg in at least 125 ml of water (half a cup).
  • Grab a test strip by blue end and insert it into the liquid, no higher than the blue line.
  • Wait until liquid starts visibly moving up the test strip (up to 15 seconds).
  • Put the test strip away on a flat dry surface and read the result in 2 minutes.

How to use a fentanyl test strip?

  • Check test strip results: a single line confirms the presence of fentanyl, while two lines (even faint) rule it out.

Fentanyl test did not react as indicated? Watch out!
All test results are available in our instructions and TestDrugs apps.


  • Faint line. Even faint second line result is enough to rule out the presence of fentanyl.
  • Injecting. If you inject you especially need to test each and every dose. It’s best to test the spoon (or cooker) residue every time before use.
  • Speed of the reaction does not indicate quantity nor purity. However, if you are having trouble interpreting your result try using a bigger sample or crushing it better before testing.
  • How many tests can you get from one test kit? A single fentanyl test strip is enough for one test.

Looking where to buy a test kit for fentanyl?

List of all SIN guides how to test drugs:

How to test 2C-B?
How to test MDA?
How to test MDMA?
How to test LSD?
How to test DMT?
How to test FENTANTYL?
How to test COCAINE?
How to test MESCALINE?
How to test KETAMINE?
How to test MEPHEDRONE?
How to test AMPHETAMINE?
How to test HEROIN & OPIOIDS?
How to test an UNKOWN substance or RCs?

and how to detect cuts or other adulterants:

How to detect LEVAMISOLE?
How to detect PMA/PMMA?
How to detect FENTANYL?
How to detect NBOMes?


A positive reaction does not indicate if the substance is safe. Due to abundance of cocaine on the market, the average purity is rapidly increasing. Remember to not mix with alcohol, not overheat and take breaks. Cocaine is both habit forming and one of the most adulterated substances available, therefore regular use can be particularly dangerous. Learn more at   

2 thoughts on “How to test COCAINE?

  1. Jurek

    Thanks, we are only getting started!

  2. Francis Mutty

    My wife discovered this blog and said I really should take a glance at it. I’m delighted that I took the time to visit your blog, it’s undeniably one of the best I’ve found

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