How to test ketamine for authenticity and safety (2026 guide)

Testing a powder sold as K? Start here

Morris is the primary test for ketamine, and it's fussier than any other reagent we sell. Sample size, stirring and the cocaine and cathinone cross-reactions all decide whether your result means anything.

Get the Ketamine Spot Kit Package Get Morris on its own

Testing gives you information you wouldn't otherwise have — it can reveal that a powder isn't ketamine at all, or that it's one of the dissociative analogs sold in its place. It cannot make a sample safe, no reagent confirms a substance by itself, and a powder is never exempt from opioid contamination just because it was sold as K. Read this page for what a color rules out, not for permission to use.

Test for fentanyl and nitazenes first

Powder sold as ketamine is not exempt from opioid contamination. Cross-contamination happens wherever powders are handled, weighed and bagged with the same equipment, and a substituted or mixed product can contain anything. Most people using ketamine have no opioid tolerance, which makes even a small amount of a potent synthetic opioid dangerous.

Our FentKits detect fentanyl and a broad range of its analogs. Dissolve roughly 10 mg in about half a teaspoon of water, dip the strip, and read at five minutes.

What fentanyl strips can't do

They don't detect nitazenes. These potent synthetic opioids need separate nitazene strips — see how to test for nitazenes.
They don't detect every fentanyl analog. Some analogs and novel opioids read negative.
A negative result only describes the portion you tested. Contamination is often uneven, so one clean strip does not clear the rest of a bag. Test multiple spots from a larger amount.
Lots vary and false positives happen. High concentrations of some other substances have been documented producing false positives.

Get fentanyl test strips Get nitazene strips

What color should ketamine turn?

Morris is a two-part reagent and the result depends on getting roughly 5 mg of well-crushed powder into the test. Ketamine's expected result is a violet-purple. The two colors that will mislead you are cocaine's neon blue and the navy you get from using too much ketamine.

Expected Morris and follow-up reagent colors for ketamine, and the confusions that matter
Reagent	Color Reaction	When to read	What it means	What it does not rule out
Morris (A then B), about 5 mg	Violet-purple	After a full 30-second stir, once the color stops changing. Ignore changes after 60 seconds	Consistent with ketamine	Synthetic cathinones give the same violet-purple. Also cannot show anything present alongside the ketamine
Morris, too much sample	Blue to navy	After a full 30-second stir	False negative. Real ketamine can read navy when you overload the test, which looks like the DCK / 2F-DCK result. Reduce your sample and run it again	Don't discard a sample on a navy result until you've retested with less
Morris, too little sample (1–2 mg)	No reaction at all	After a full 30-second stir	Unresolved, not negative. Morris simply won't react below roughly 5 mg of ketamine	Everything. Retest with more material before drawing any conclusion
Morris — cocaine	Bright, almost neon blue	After a full 30-second stir	Consistent with cocaine, not ketamine. Cocaine is a plausible substitute in powder sold as K and the two are dosed completely differently	Do not use as ketamine
Morris — DCK, 2F-DCK	Navy blue	After a full 30-second stir	Points to deschloroketamine or 2-fluorodeschloroketamine — not ketamine	Overloaded ketamine looks the same. Confirm by retesting with a smaller sample
Morris — most other substances	Muddy or pale green	After a full 30-second stir	Not ketamine, not cocaine, not DCK. Morris rarely names what it is	Almost everything. A muddy green is a "look elsewhere" result
Morris — other local anesthetics, diphenhydramine, PCP	Blue or blue-tinged	After a full 30-second stir	Morris uses cobalt thiocyanate chemistry, which responds to lidocaine, procaine, benzocaine and tetracaine, to diphenhydramine, and to PCP	These can sit close to cocaine's blue and muddle a purple/blue call
Liebermann	Very weak pale yellow, and only with a large sample	Within 60 seconds	An exclusion reagent. It doesn't identify ketamine — it's there to flag adulterants that react strongly when ketamine barely does	Ketamine itself, effectively. A faint or absent result here is uninformative on its own
Mecke	No strong reaction expected from ketamine	Within 60 seconds	Exclusion reagent. Strong color here means something other than ketamine is present in quantity	Compare the specific hue against the printed Mecke booklet for the dissociative analogs
Froehde	No strong reaction expected from ketamine	Within 60 seconds	Exclusion reagent, used the same way as Mecke	Compare against the printed Froehde booklet rather than assuming a hue

Swatches are approximate on-screen hues for orientation only. Match your result against the printed booklet or the BunkLeaks app in bright neutral daylight, not against a monitor.

Morris reagent color guide — dozens of reference reactions, including the ketamine violet-purple, the cocaine neon blue and the DCK navy side by side. Also included as the printed booklet in every Morris Spot Test Kit.

Morris is a two-part kit — sample size, order and stirring all matter

Crush the sample completely. Shards and crystals give unreliable colors. Powder it.
Measure about 5 mg — half of one of our 10 mg measuring spoons. This is the one place a rough eyeball won't do.
Add one drop of Morris A.
Then add one drop of Morris B.
Stir for a full 30 seconds with a toothpick or knife tip.
Read once the color has stopped changing. Ignore any change after 60 seconds.

Skipping the stir is the most common reason people get a weak, muddy or absent reaction. Getting the quantity wrong is the second.

The two Morris errors that get ketamine misread

Too much sample turns real ketamine navy blue. That's the same color range as DCK and 2F-DCK, so a heavy hand makes you conclude you have an analog when you have ketamine. If you get a navy, lower the sample size and run it again before you believe it.

Synthetic cathinones give the same violet-purple as ketamine. A purple on Morris alone cannot separate ketamine from a cathinone — and cathinones are stimulants with a completely different risk profile and dose range. This is why the follow-up reagents in the package exist: ketamine reacts weakly or not at all with Liebermann, Mecke and Froehde, so a strong color on any of them alongside a Morris purple points to a cathinone rather than ketamine.

Both of these are covered in our own write-up, Testing for ketamine? Avoid these common mistakes.

Morris limitations

Morris does not identify individual dissociatives. It sorts results into a few buckets: violet-purple (ketamine or a cathinone), neon blue (cocaine), navy (DCK / 2F-DCK, or overloaded ketamine), muddy or pale green (most other things). It does not give a distinct, readable color for each of the dozen analogs sold as K.
Cobalt thiocyanate cross-reacts. Other local anesthetics (lidocaine, procaine, benzocaine, tetracaine), diphenhydramine and PCP can all produce blue or blue-tinged results.
Morris is still under study. Formulations differ between manufacturers and the reaction set is still being characterised. Treat published colors as the best current reference, not a fixed standard.
A color is about what's most abundant. A minor adulterant in an otherwise real sample can be completely masked.

Cross-reference with more reagents

The Ketamine Spot Kit Package includes Morris, Mecke, Liebermann and Froehde, and costs less than buying the four separately.

Ketamine Spot Kit Package with Morris, Mecke, Liebermann and Froehde reagents

What's in the package

Morris reagent (two parts, A and B): The primary test for ketamine. Violet-purple at about 5 mg. Also gives violet-purple with synthetic cathinones, neon blue with cocaine and navy with DCK / 2F-DCK.
Mecke reagent: Exclusion reagent. Ketamine gives no strong reaction, so color here means something else is present in quantity — including dissociative analogs such as MXE, MXP, 3-MeO-PCP and 3-MeO-PCE.
Liebermann reagent: Exclusion reagent. Ketamine gives at most a very weak pale yellow and only with a large sample. Useful for flagging ephenidine, 2F-ketamine, N-ethyl-ketamine, MXE, 3-MeO-PCE, 3-MeO-PCP and MXP.
Froehde reagent: Exclusion reagent covering a similar adulterant range to Liebermann. Ketamine gives no strong reaction.

The three follow-up reagents earn their place precisely because ketamine reacts weakly or not at all with them. That's what makes a strong color meaningful — and it's the only practical way to separate a Morris purple caused by ketamine from a Morris purple caused by a synthetic cathinone.

Mecke reagent color guide — reference reactions for the dissociative analogs commonly sold as ketamine.

Froehde reagent color guide.

Liebermann reagent color guide. Ketamine barely registers here, which is the point — read this booklet for what an adulterant looks like.

What gets sold as ketamine instead

Substances found in place of or alongside ketamine, and how to screen for them
Substitute or adulterant	How to screen for it
Cocaine	Morris — bright neon blue instead of violet-purple. A plausible substitute and a completely different dose range
DCK (deschloroketamine)	Morris — navy blue. Retest with less sample to rule out overloaded ketamine
2F-DCK (2-fluorodeschloroketamine)	Morris — navy blue, same caveat as DCK
Synthetic cathinones	Morris cannot separate these from ketamine — both give violet-purple. Follow up with Liebermann, Mecke and Froehde, where ketamine is quiet and cathinones are not
PCP	Morris — blue or blue-tinged via cobalt thiocyanate cross-reactivity
2-Oxo-PCE, O-PCE, 3-MeO-PCE, 3-MeO-PCP, 3-Cl-PCP	Morris flags them as "not ketamine"; Mecke and Froehde for the specific hue. Compare against the booklets
MXE (methoxetamine)	Mecke, Liebermann and Froehde
MXP (methoxphenidine)	Mecke and Froehde. MXP and MXPr are different compounds — don't treat the abbreviations as interchangeable
MXPr (methoxpropamine)	Morris flags it as not ketamine; cross-reference the booklets for the specific reaction
EPE, DPD, ephenidine	Froehde and Liebermann
2F-ketamine, N-ethyl-ketamine	Froehde and Liebermann
Other local anesthetics (lidocaine, procaine, benzocaine, tetracaine)	No reliable reagent identification — they cross-react with Morris. Lab analysis to confirm
Fentanyl	Fentanyl test strips. Reagent colors will not show it
Nitazenes	Nitazene test strips — fentanyl strips do not detect these
Inert cuts and fillers	Not detectable by color. Lab analysis if you need to know what fraction is active

How pure is it?

The Ketamine Spot Kit Package tells you what's likely present, not how much of it there is. Reagent color is driven by whatever is most abundant, so a heavily cut sample and a clean one can look the same. If you need an actual concentration figure, that's lab analysis — GC-MS or FTIR will quantify what a color cannot.

Which test do I need?

Is this ketamine or cocaine?

Morris. Violet-purple versus neon blue, after a full 30-second stir on about 5 mg.

Shop Morris

Is it a cathinone pretending to be K?

You need the follow-up reagents. Morris alone can't answer this.

Shop the package

Is there an opioid in it?

Strips, not reagents. Fentanyl plus nitazene, read at five minutes.

Shop FentKit

Step by step

Test for opioids first. Roughly 10 mg in half a teaspoon of water, fentanyl strip and nitazene strip, read at five minutes. Test more than one spot from a larger amount.
Crush thoroughly. Morris needs powder, not shards.
Measure about 5 mg — half a 10 mg measuring spoon.
Run Morris. One drop A, one drop B, stir a full 30 seconds, read when the color settles and ignore anything after 60 seconds. Violet-purple is consistent with ketamine.
If you got navy, retest with less. Overloading turns ketamine navy and imitates DCK.
If you got nothing, retest with more. Below roughly 5 mg Morris simply won't react.
Cross-reference on fresh samples with Liebermann, Mecke and Froehde. Ketamine should be quiet on all three. Strong color means something else is in there — a cathinone included.
Record it. Photograph your results and consider reporting them to BunkLeaks so others benefit.

Things that ruin a test

Not stirring Morris for the full 30 seconds. This is the single most common mistake.
Too much sample — real ketamine reads navy and you conclude DCK.
Too little sample — 1–2 mg gives no reaction at all, which looks like a negative.
Samples that aren't fully crushed.
Reading Morris after 60 seconds. Late drift is not part of the result.
Dim or colored lighting. Bright neutral daylight, and compare against the printed booklet.
Running two reagents on the same sample, or reusing a tube. Use a fresh portion for each.
Old reagent. It degrades; store it cool and dark, and replace it annually.
Reading only Morris. A violet-purple on its own cannot separate ketamine from a synthetic cathinone.

Your result wasn't what you expected

Don't consume it. Here's what to do instead.

Rule out the test itself first. With Morris this is unusually important: retest with a smaller sample if you got navy, a larger one if you got nothing, fresh reagent, a full 30-second stir, and bright daylight. A lot of "wrong" Morris results are sample-size errors.
Report it. Log the sample in BunkLeaks — an unexpected result in your area is a warning for everyone else in it.
Find out what it actually is. Our lab testing service gives you a definitive answer where reagents can't, including the cathinone-versus-ketamine question and the specific analog.
If an opioid is plausible, have naloxone in the room. Powder sold as K can be contaminated or substituted. Never use alone, and start far below your usual amount. Ketamine's own sedation makes an unrecognised opioid harder to spot in someone.
A neon blue means stop. If Morris goes bright blue you are most likely looking at cocaine, which is dosed nothing like ketamine.

Questions

Does a Morris purple confirm ketamine?

No, and we've stopped implying that it does. Morris is the primary test for ketamine and a violet-purple result is consistent with it, but synthetic cathinones give the same color, and cobalt thiocyanate also responds to other local anesthetics, diphenhydramine and PCP. Morris narrows it down. It doesn't confirm.

My sample turned navy. Is it DCK?

Maybe, or you used too much. Overloading Morris turns real ketamine navy blue, which sits in the same range as DCK and 2F-DCK. Halve your sample and run it again before you conclude anything. This is a documented false negative.

Nothing happened at all. Is it fake?

Unknown. Morris won't react to 1–2 mg of ketamine. Increase to about 5 mg, make sure it's fully crushed, stir the full 30 seconds, and check that your reagent isn't over a year old. A non-reaction is an unresolved test, not a negative.

How do I tell ketamine from a synthetic cathinone?

Not with Morris alone — both give violet-purple. The practical approach is the rest of the package: ketamine reacts weakly or not at all with Liebermann, Mecke and Froehde, so a strong color on those alongside a Morris purple points away from ketamine. If it matters, lab analysis is the reliable answer.

Does Liebermann identify ketamine?

No. We used to say it did. Liebermann gives at most a very weak pale yellow with ketamine and needs a large sample to give even that. It's an exclusion reagent — its value is flagging adulterants that react strongly where ketamine doesn't.

Do I need fentanyl strips for ketamine?

Yes, we'd use them. Ketamine powder isn't exempt from opioid contamination, and most people using it have no opioid tolerance. Add nitazene strips as well — fentanyl strips don't detect nitazenes.

How much do I need to test?

Morris wants about 5 mg, which is half of a 10 mg measuring spoon. The other reagents are less fussy; a few milligrams is fine. Strips need roughly 10 mg in about half a teaspoon of water.

Does a good test mean my ketamine is safe?

No. Reagent results are presumptive, they only describe the portion you tested, and they show what's most abundant rather than everything present. Testing lowers your chance of an unpleasant surprise. It doesn't remove risk.

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Morris, Mecke, Liebermann and Froehde · Discreet packaging

More resources

Testing for ketamine? Avoid these common mistakes — the sample-size problem in detail
Morris reaction booklet
Our types of test kits
Skylab separation kit basics — for mixed samples
How to test cocaine — the other side of the Morris blue/purple confusion
How to test for nitazenes — why fentanyl strips aren't enough
Reaction video library — watch colors develop in real time
Spectrum color guide
Lab testing service

Disclaimer

A sample that has been tested should not be considered safe. There is inherent risk when choosing to consume any substance.

Many factors are involved when conducting a test and examining reactions, and The Bunk Police does not assume responsibility for the interpretation of results. Reactions of individual samples can vary depending on lighting differences and the specific mixtures of substances being tested.

Bunk Police kits are intended for identifying unknown substances for harm reduction purposes only. The Bunk Police does not assume responsibility for the use or misuse of this information. Proceed at your own risk.