Drug tests
by EZ Test
The EZ Test Cocaine Purity Test is a single-step reagent kit that estimates the purity of cocaine in seconds — no lab equipment, no waiting days for results. Drop a minimum of 20mg into the phial, give it a few seconds, and the colour reaction tells you roughly how pure your sample actually is. It won't identify specific cutting agents, but it gives you a fast, practical read on what you're dealing with before you make any decisions.
The EZ Test Cocaine Purity Test comes in three variants. A single test is the obvious pick if you just want a one-off check. The 5-pack suits anyone who tests semi-regularly — say, every few months or whenever you switch sources. The 10-pack is the best value per test and makes sense if you're buying for a group of mates or want a stash on hand for the year. Each phial is single-use only, so buy according to how often you'll actually test.
| Variant | SKU | Best for |
|---|---|---|
| 1 test | SM0181 | One-off check, trying the kit out |
| 5 tests | SM0182 | Regular personal use, occasional testing |
| 10 tests | SM0374 | Best value per test, groups, frequent testing |
Purity directly affects price — and risk. If you're paying top-shelf prices for something that's been heavily cut, you're throwing money away. Worse, you have no idea what you're actually putting up your nose. According to DanceSafe's cocaine testing guidance, cocaine is increasingly being cut with other substances, which makes testing before use a basic harm-reduction step rather than an optional extra.
We've carried EZ Test kits in the shop since the early days, and the cocaine purity test (formerly sold as EZ Test White) is consistently one of the most requested. The reason is simple: it takes about 30 seconds to run, uses no dangerous reagents, and gives you a colour-graded indication of purity that's far more useful than trusting someone's word. The phial is small enough to fit in a jacket pocket, and the whole process requires zero chemistry knowledge.
Here's the honest limitation: this test tells you how pure your sample is, but it cannot tell you what it's been cut with. Some common adulterants — lidocaine, procaine, levamisole — won't show up as specific substances. You'll see a lower purity reading, but you won't know the identity of the cut. For that, you need a separate test designed to identify cutting agents. Think of the purity test as the first filter: it answers "is this worth my time?" before you go deeper.
One thing we've noticed behind the counter: people who start testing tend to keep testing. Once you've seen the difference between a sample that reads high purity and one that barely registers, you don't go back to guessing. It changes how you evaluate what you're buying — and that's the whole point of harm reduction.
The whole process takes under a minute. If the result looks ambiguous, run a second test with a fresh phial and a slightly larger sample. The included instruction sheet has a detailed colour gradient — keep it handy rather than trying to remember from last time.
| Specification | Detail |
|---|---|
| Brand | EZ Test |
| Test type | Cocaine purity estimation (colourimetric reagent) |
| Former name | EZ Test White |
| Minimum sample size | 20mg |
| Result time | Seconds |
| Dangerous reagents | No |
| Uses per phial | 1 (single-use) |
| Pack sizes available | 1, 5, or 10 tests |
| Includes | Sealed phial(s), colour chart, instruction sheet |
| Identifies cutting agents | No — use EZ Test for Cocaine Cuts for that |
The purity test tells you how much is cocaine — but not what the rest is. Pair it with the EZ Test for Cocaine Cuts to identify common adulterants like lidocaine and procaine. Running both tests together gives you the most complete picture a home kit can offer. If you test other substances too, the EZ Test Marquis is worth keeping in the drawer.
We've sold EZ Test kits since we opened the webshop in 1999, and the cocaine purity test has always been a steady seller. The most common reaction from first-time testers? Surprise — and usually not the pleasant kind. Most people overestimate the purity of what they're buying by a wide margin. We've had customers come back saying the test saved them from paying premium prices for something that was mostly filler. That's a win.
The texture of the phial itself is worth mentioning: it's a small glass ampoule, feels sturdy enough in your hand, and the snap-open top is straightforward. No fiddly caps or droppers. The reagent inside is a clear liquid — no strong smell, no caustic fumes. Compared to some of the older Marquis-style tests where you're handling sulphuric acid, this is significantly more user-friendly. That said, don't get it on your skin or in your eyes. Common sense applies.
One thing this test won't do — and we'd rather be upfront about it — is give you a precise percentage. You're not getting "73.4% pure" from a colour chart. What you're getting is a reliable ballpark: high purity, moderate purity, low purity, or "your dealer is having a laugh." For scientifically precise results, a laboratory analysis is the only option. But for a quick field check that costs a few quid and takes 30 seconds, nothing else comes close.
It estimates the overall purity of cocaine in your sample using a colourimetric reagent reaction. The stronger and more defined the colour change, the higher the purity. It does not identify specific cutting agents — for that, you need the EZ Test for Cocaine Cuts.
No. The EZ Test Cocaine Purity Test only estimates purity — it cannot distinguish between different adulterants like lidocaine, procaine, or levamisole. If you want to know what's in the mix besides cocaine, run the EZ Test for Cocaine Cuts alongside it.
A minimum of 20mg — roughly a match-head-sized amount. Using less than 20mg may produce a faint or unreliable colour reaction. Slightly more is fine; significantly more won't improve accuracy.
Reagent testing uses a chemical solution that changes colour when it reacts with specific substances. You add a small sample to the reagent, observe the colour change, and compare it against a reference chart. It's the same principle used by DanceSafe and other harm-reduction organisations worldwide.
Highly sensitive and reliable for a field test, but it gives an estimate — not a lab-grade percentage. According to a study published in the Journal of Analytical Toxicology, on-site colourimetric tests show good specificity and accuracy for cocaine detection, though sensitivity can vary with sample composition. For precise numbers, submit your sample to a laboratory.
No. Each phial is strictly single-use. Once the reagent has reacted with a sample, it's spent. Attempting to reuse a phial will give you meaningless results. Buy the 5 or 10 pack if you test regularly.
The EZ Test Cocaine Purity Test is designed for cocaine hydrochloride (powder). It may react with freebase forms, but the colour chart is calibrated for powder cocaine. Results with crack may be less reliable — use with that limitation in mind.
Keep them sealed in a cool, dry place away from direct sunlight. The reagent inside has a shelf life, so don't stockpile more than you'll use within a year or two. Check the expiry information on the packaging before use.
Last updated: April 2026
This product description was drafted with AI assistance and reviewed by Luke Sholl, Cannabinoids & smartshop specialist since 2011. Editorial oversight by Joshua Askew.
Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.
