Should You Test LSD? The NBOMe Risk
Yes. Blotter sold as acid is sometimes NBOMe, which kills. How an Ehrlich test catches it in two minutes, and what it cannot tell you.
June 10, 2026 · Jordan Mercer
Contents
Yes, and not because LSD is hard on your body. Because what gets sold as LSD sometimes is not LSD. Blotter, liquid and tabs are occasionally NBOMe compounds, which look identical on paper and can cause seizures, severe hyperthermia and death at doses a single square holds easily.
An Ehrlich reagent test cannot confirm you have LSD. What it can do is rule out the substitute that kills. If the paper does not react with Ehrlich, do not take it. That is two minutes of work and it is the highest-value thing you can do before dosing.
LSD is forgiving. “Acid” might not be.
LSD is active in micrograms. A normal dose is 75 to 150 of them, an almost invisible quantity. That potency is precisely why adulteration is invisible: there is so little active material on a tab that swapping in a different microgram-scale chemical changes nothing you could see, taste or feel.
Its own toxicity is remarkably low. A 2020 case series in the Journal of Studies on Alcohol and Drugs documented three accidental massive overdoses, including a woman who insufflated an estimated 55 mg of pure LSD, roughly 550 times a recreational dose, and survived without lasting physical harm. The real risks of genuine LSD are psychological and behavioural, not organ toxicity. For the interaction that genuinely does cause seizures, see LSD and lithium.
So if you have LSD, you are in decent shape. The question is whether you have LSD.
NBOMe is the substitute that kills
The 25x-NBOMe family, 25I, 25B and 25C, appeared as research chemicals sold on blotter and passed off, knowingly or otherwise, as acid. They are potent 5-HT2A agonists, so a low dose produces psychedelic effects that someone without much experience could mistake for LSD.
What is not similar is the safety margin. NBOMe compounds have a steep dose-response curve and real physical toxicity: severe agitation and delirium, tachycardia, hypertension, hyperthermia, clonus and tonic-clonic seizures, rhabdomyolysis with the kidney failure that follows it, and death.
A 2015 case series in the Journal of Analytical Toxicology documented two fatal intoxications in Indiana teenagers tied to 25B-NBOMe and 25I-NBOMe. A 2013 report in Clinical Toxicology describes life-threatening 25I-NBOMe intoxication, and an analytically confirmed case describes a suicide attempt in someone who believed they had taken good acid (PMC4220298).
There is a folk rule worth knowing: if it’s bitter, it’s a spitter. Real LSD is tasteless. NBOMe is noticeably bitter and often numbs the tongue. A tab that tastes like anything is a warning. But that is a backstop, not a test, and it involves putting an unknown chemical in your mouth to find out.
How the Ehrlich test works
Ehrlich reagent reacts with the indole ring that LSD contains. NBOMe compounds are phenethylamines with no indole, so they do not react at all. That chemical difference is the entire reason this test is worth doing.
- Cut a small corner off the tab, about a quarter. You do not need the whole thing.
- Put it on a white ceramic surface or the test tray, or straight into an Ehrlich tube if your kit uses that format.
- Add one or two drops of reagent directly onto the paper.
- Wait two to five minutes. An indole turns the spot purple through to pink or magenta. The reaction can be slow, so do not call it early.
- Read it under white light against the kit’s chart.
No colour change means no indole, which means it is not LSD. Do not take it.
What the test cannot tell you
A purple reaction is a good sign, not a green light. Being clear about the limits is what makes the test worth trusting at all.
It does not identify LSD specifically. Other indoles also turn Ehrlich purple. The harm reduction logic is that NBOMe, the main lethal substitute, is not an indole, so a clean purple makes NBOMe very unlikely. That is the value. It is not a positive ID.
It does not detect NBOMe. A blank result is informative because it means “not LSD,” but Ehrlich cannot tell you what the non-reacting substance actually is. A dedicated 25-NBOMe colour spot test, validated in 2021 in Drug Testing and Analysis, or mass spectrometry, is what answers that.
It cannot measure dose. Reagents detect presence, not potency. A genuine tab can still be far stronger than you expected.
One reagent is one data point. Colour tests depend on a person reading a colour correctly, and results can be ambiguous. Hofmann reagent, which turns blue specifically for LSD, narrows it further when used alongside Ehrlich.
If you are at an event running a drug checking service with spectrometry, that beats any colorimetric kit by a wide margin. For everyone else, Ehrlich at home is the realistic baseline.
Two checks catch most of the real risk here: no reaction means do not dose, and a bitter or numbing tab means do not dose. Neither is complicated, and both take less time than the drive to the party.
For dosing, timeline, set and setting, see our LSD harm reduction guide and how long an LSD trip lasts.
Sources
- LSD overdoses: three case reports. Journal of Studies on Alcohol and Drugs, 2020. PMID 32048609
- Fatal intoxications with 25B-NBOMe and 25I-NBOMe in Indiana during 2014. Journal of Analytical Toxicology, 2015. PMID 26378133
- A case of 25I-NBOMe intoxication: a new potent 5-HT2A agonist designer drug. Clinical Toxicology, 2013. PMID 23473462
- Development and validation of a colour spot test method for the presumptive detection of 25-NBOMe compounds. Drug Testing and Analysis, 2021. PMID 32744773