HEROIN & Opioids Dual SIN Reagent Test Kit (2 tests)

(2 customer reviews)


FREE PRIORITY SHIPPING Discreet packaging, with no mention of “SIN”. SAME DAY shipping for all orders paid until 11 GMT.

  • 2in1 – 1x MARQUIS test, 1x FROEHDE test
  • Instructions (for 550+ substances with apps)
  • 1 micro spatula
  • Available also as multiple-use bottles

Mix&Match! (discounts apply in cart):
Get 2 kits, receive 4 tests3.25 € each
Get 4, pay for 3 (8 tests / 2.95 €)
Get 7, pay for 5 (14 tests / 2.82 €)
Get 10, pay for 7 (20 tests / 2.75 €)

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By purchasing SIN Dual Heroin Test Kit you support our fight for drug policy based on harm reduction, human rights, and facts, not prejudice.

Mix&Match! (Dual kits discounts apply in cart):

  • 2 Duals = 4 tests / 3.25 €
  • 3 Duals = 6 tests / 3.04 €
  • 4 Duals = 8 tests / 2.95 €
  • 5 Duals = 10 tests / 2.89 €
  • 6 Duals = 12 tests / 2.85 €
  • 7 Duals = 14 tests / 2.82 €
  • 8 Duals = 16 tests / 2.79 €
  • 9 Duals = 18 tests / 2.78 €
  • 10 Duals = 20 tests / 2.75 €



Dual Heroin Test Kit comes with 2 single-use reagents for heroin as well as its common adulterants. It is used to positively identify heroin, morphine, codeine, oxycodone, and to rule out U-47700, U-49900, fentanyl, and different, less predictable and less desirable, highly toxic dangerous drugs. Multiple reagents are required to detect adulterants and increase analysis precision.

The Dual Heroin Test Kit instructions and apps feature over 500 substances. Each single-use vial contains 0,2 ml (4 drops) of a reagent. Glass protects reagents from light, plastic, and moisture to ensure prolonged shelf life. For extra-stealth ask us in the checkout notes to remove substance-related stickers and fliers.

SIN Dual Heroin Test Kit consists of 2 reagents: Marquis and Froehde (2 tests total). It’s best to use this set for ketamine and other dissociatives, but it’s also good for meth/amphetamines, cocaine and opioids.

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

Are you still looking for the best reagent test? See all drug testing kits HERE.



NOTE: Dual Heroin Test Kit 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.

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

Dual Heroin Test Kit Flowchart
How to test heroin and other opioids? Instructions how to use the Dual Heroin Test Kit with reagent tests Marquis and Froehde.

BEFORE using a heroin test kit

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

STEP ONE for testing heroin powder / crystal

  • Take and finely crush a small piece, no bigger than a head of a needle – like this •.
  • Carefully open a vial and using included spatula move the sample into the vial.
  • Wait for the results and check instructions.
  • Dispose of safely.

How to use a heroin test kit?

  • Check test results with Marquis test kit: if testing heroin there should be a reddish violet color change reaction.
  • Check test results with Froehde test kit: if testing heroin there should be a purple color change reaction.

AFTER using a heroin test kit

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


  • 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). One fentanyl test strip is good for 1 test.

All heroin test results:

MARQUIS Reddish Violet
MECKE Blueish Green
MANDELIN Red > Dark Brown
LIEBERMANN Violet > Black
FROEHDE Violet / Red > Black
EHRLICH No color change
HOFMANN No color change
SIMON’S No reaction
ROBADOPE No reaction
SCOTT No full color change

Heroin 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 heroin 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 different reagent test for heroin?



Reagents consist mostly of concentrated acid and are 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 minimum shelf life of 2 years 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 0.049 kg
Shelf life

12 months +

2 reviews for HEROIN & Opioids Dual SIN Reagent Test Kit (2 tests)

  1. eBay Buyer c***4

    Perfect transaction . Super fast shipping!!

  2. eBay Buyer r***1

    Perfect. Thanks

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