Discarding the first part of a distillation run is a flavour practice, not a safety control, because methanol is present in almost every fraction and an early cut removes only a small share of it. The control that matters is the feedstock: the EU limit for methanol is 1,000 to 1,500 g per hectolitre of pure alcohol in fruit and pomace spirit against 30 in neutral spirit, home fruit distillate often exceeds even that, and poisoning shows 12 to 48 hours late, so a drink that tasted fine proves nothing. Fuel alcohol must never be drunk.
Part of Ethanol Fuel Production
Methanol is the toxic one-carbon alcohol that forms during fermentation, mostly from pectin, and is present throughout a distillation run in amounts set chiefly by the feedstock.
The foreshots cut does not make a distillate safe to drink
Earlier versions of this page and of the other distillation pages in the corpus presented the discard of the first 50 to 100 mL as the step that removes the methanol. It is not. It is a flavour step. Methanol is spread through the run, a fruit or pomace wash can carry grams of it per litre of finished spirit, and no discard rule fixes that. A reader who believes the cut made a fruit spirit safe is the person this page exists to stop.
Methanol Spreads Through The Whole Run, So The Early Cut Cannot Remove It
Methanol comes from pectin, through the enzyme pectin methylesterase, so it forms in any ferment that holds pectin and forms most in pectin-rich fruit. It boils at 64.7°C, below ethanol’s 78.4°C, and that difference is why the corpus used to teach that it comes off first and can be thrown away with the foreshots. That is not what has been measured.
- Blumenthal and colleagues (Molecules 26(9):2585, 2021, section 4.3.1) found methanol in “almost equal concentration in almost all fractions”, accumulating in the tailings rather than the heads. The paper traces the widespread claim that methanol is enriched in the heads to a translation mistake.
- An AIChE 2016 paper reports the same spread, with the ratio of methanol to ethanol rising through the run.
- The sharp solvent smell of the first jars is acetaldehyde and ethyl acetate, not methanol. A harsh smell does not mark methanol, and a clean smell later in the run does not mean it is absent. Temperature Control already said that methanol “distributes throughout the run”; that statement was right.
What an early cut can remove. Suppose, as the paper found, that each millilitre of distillate carries about the same methanol. A 20-litre wash at 10% ABV holds 20 × 0.10 = 2 litres of pure alcohol, so the run delivers at least 2 litres of distillate (2 litres of alcohol cannot come over in less). Discarding 50 mL then takes away 50 ÷ 2,000 = 2.5% of the methanol, or less if the run is larger or the tailings hold more. At least 97.5% stays in the jars you keep.
The Foreshots Cut Is For Flavour, And It Is Still Worth Making
Discarding the first fraction drops the acetaldehyde and ethyl acetate that taste and smell harsh, and for taste it is worth doing. It is not a safety step, and describing it as one is the real danger: it tells the reader that a fruit wash has been made safe when it has not.
The discard volumes the corpus has given have no primary source. They appear only in hobbyist forum posts, and the corpus stated the rule five different ways: 50 mL per 20 litres, 50 to 100 mL per 20 litres, 50 to 100 mL per 10 litres, 50 to 100 mL per 25 litres, and the first 10% of the expected distillate. That they disagree is itself evidence that nobody measured it. Treat any of them as guidance on taste.
Feedstock Is The Control: Fruit And Pomace Spirit Are Allowed 33 To 50 Times The Methanol Of Neutral Spirit
The EU sets maximum methanol contents in grams per hectolitre of pure alcohol (g/hL pa); the limits below are those listed by the German BfR and reproduced in Blumenthal 2021. The right-hand columns are converted below the table.
| Feedstock | EU limit (g/hL pa) | Per litre of pure alcohol | Per litre of 40% ABV spirit | Times the neutral limit |
|---|---|---|---|---|
| Agricultural ethyl alcohol (neutral, grain) | 30 | 0.3 g | 0.12 g | 1 |
| Fruit spirits generally | 1,000 | 10 g | 4 g | 33 |
| Apple, pear, plum and similar | 1,200 | 12 g | 4.8 g | 40 |
| Quince and some berries | 1,350 | 13.5 g | 5.4 g | 45 |
| Fruit marc (pomace) | 1,500 | 15 g | 6 g | 50 |
The conversion. A hectolitre is 100 litres, so 1,000 g per hL of pure alcohol is 1,000 ÷ 100 = 10 g per litre of pure alcohol. A 40% ABV spirit is 0.4 litre of pure alcohol per litre of bottle, so a fruit spirit at the 1,000 limit carries 10 × 0.4 = 4 g of methanol per litre of bottled spirit. Neutral spirit at 30 carries 30 ÷ 100 = 0.3 g per litre of pure alcohol, and 0.3 × 0.4 = 0.12 g per litre at the same strength. The last column is the limit divided by 30: 1,000 ÷ 30 = 33, 1,200 ÷ 30 = 40, 1,350 ÷ 30 = 45, 1,500 ÷ 30 = 50. As a cross-check, BfR’s own worked example is vodka at 10 g/hL pa and 37.5% ABV: 10 ÷ 100 × 0.375 = 0.0375 g per litre.
Three things follow.
- The choice of what goes in the still moves methanol by a factor of tens; the early cut moves it by a few per cent. A reader who wants to distil something to drink should use a grain or sugar wash, not fruit or pomace.
- These are legal ceilings, not measurements of a home still. The 30 limit is for agricultural ethyl alcohol, a rectified neutral spirit. The sources behind this page give no measured methanol figure for home grain or sugar spirit, so “lower” must not be read as “zero”.
- Pectin is the reason. The corpus’s Alcohol Safety page lists the pectin-rich ferments (apples, pears, plums, grapes, overripe or damaged fruit) that produce the most.
Home Fruit Spirit Frequently Exceeds Even The Fruit Limits
These figures are measured values from published surveys, taken from summaries of the papers rather than from reading each in full, so treat them as indicative:
- Macedonian plum brandy measured 416 to 458 g/hL pa in one set, and one set of 30 samples averaged 1,903 g/hL pa, above the 1,200 cap for plum.
- A Romanian study of 56 home-produced spirits found that only 18% met the EU limit.
- Cherry spirits measured around 400 to 500 g/hL pa.
Convert the 1,903 average the same way: 1,903 ÷ 100 × 0.4 = 7.6 g of methanol per litre of 40% spirit. That is more than the 3.16 g at the bottom of the blindness range reported by Moon (below), in one litre. This is a hazard of the feedstock, and no discard rule addresses it.
Poisoning Shows 12 To 48 Hours Late, So A Drink That Tasted Fine Proves Nothing
UKHSA (“Methanol: toxicological overview”, gov.uk, updated 11 October 2024) gives a latency of 12 to 24 hours, up to 48. The toxicant that does the damage is formic acid.
Ethanol delays the onset further, because it competes with methanol for the same enzyme. In a spirit that holds both, the ethanol in the same glass delays the effect of the methanol without reducing the dose, which is why a poisoning presents late and why the drinker feels fine at first.
So “it tasted fine and nobody was ill that evening” proves nothing, and neither does smell, because a harsh smell is not methanol and a clean smell does not mean it is absent. The control that the evidence supports is applied before the still is lit: which feedstock goes into it.
Every Lethal Figure Is A Dose Of Pure Methanol, Not A Volume Of Spirit
Earlier pages placed “30 mL can be fatal” next to “discard the first 50 mL”, which invites the reader to think the 50 mL poured away held the 30 mL that would have killed them. It did not. Every figure in the table is a dose of pure methanol; a distillate is mostly ethanol, and as the arithmetic above shows, the discarded 50 mL carries about 2.5% of a run’s methanol or less.
| Source | Figure, as pure methanol |
|---|---|
| UKHSA 2024 | Permanent visual damage from 4 to 10 mL in an adult; minimum lethal dose 300 to 1,000 mg/kg, which at 70 kg is 21 to 70 g |
| UKHSA 2024, a reported lethal case | 15 mL of a 40% solution: 15 × 0.4 = 6 mL of pure methanol, about 4.7 g |
| Moon 2017, Annals of Occupational and Environmental Medicine 29:44 (32 papers reviewed) | Minimum lethal 15.8 g (about 20 mL), median 56.2 g, blindness at 3.16 to 11.85 g |
| IPCS | 0.3 to 1 g/kg, which at 70 kg is 0.3 × 70 = 21 g to 1 × 70 = 70 g |
The sources disagree at the low end, and this page does not resolve it. The lowest lethal amount is 4.7 g in the UKHSA case and 15.8 g in Moon’s review, a factor of 15.8 ÷ 4.7 = 3.4. The origin of the lower figure could not be traced. The per-kilogram ranges are higher again. The honest reading is that the lower bound is not well established, and it should be treated as the working figure precisely because it is the unfavourable one: about 4.7 g, roughly 6 mL of pure methanol, as a possible lethal amount, and 4 mL as the amount that can permanently damage sight. The 10 mL the corpus used to give for blindness is the optimistic end of UKHSA’s 4 to 10 mL range. The per-kilogram figures scale with body size, so a smaller person is harmed by less.
Two earlier figures could not be confirmed from any source and are withdrawn: “a fatal dose is approximately 1 mL/kg of body weight, roughly 70 mL” and “30 mL can be fatal”. The sourced minimum-lethal figures are all lower than those and all expressed as mass of pure methanol.
Documented Outbreaks Come From Adulteration, And That Is Not A Safety Guarantee
The outbreaks the survey found were adulteration and illicit spirits, not fermentation:
- Uganda 2017 (Birungi and colleagues, PMC7204301): 15 cases and 12 deaths, samples averaging 1,200 mg/L, from deliberate methanol adulteration.
- Iran 2020 (PMC9189800): 795 admissions and 84 deaths, driven by false claims that alcohol cured COVID-19.
No documented outbreak from fermentation-derived methanol in a home distillate was found. That is not evidence of safety, for two reasons. The surveys above show home fruit distillate at levels the EU treats as unacceptable. And the Uganda figure cannot be set against the EU limits, because that paper gives no ABV for its samples: at 40% ABV, 1,200 mg/L is 1,200 ÷ 0.4 = 3,000 mg, or 3 g, per litre of pure alcohol, which is 300 g/hL pa and under the fruit cap; at 10% ABV it is 1,200 ÷ 0.1 = 12 g per litre of pure alcohol, which is 1,200 g/hL pa, over the 1,000 general fruit cap and level with the 1,200 cap for apple, pear and plum. The ABV decides it and is unknown, so that outbreak argues neither way about fermentation and is not used here to argue either.
For Fuel, Methanol Does Not Matter To The Engine, Only To People
For fuel the parent is right that discarding the foreshots is a minor matter, and the reason is stronger than “less critical”: the cut is a flavour step, and methanol burns, so a small amount in fuel ethanol changes nothing worth managing. Two things remain:
- It corrodes aluminium (the parent), so avoid aluminium fittings in a system that may carry it.
- Anyone who touches, breathes or swallows any distillate from a wash is exposed to methanol, not only the first jars. Label the first fraction as poison anyway, because it is the most solvent-like liquid off the still, keep it in a labelled sealed container well away from drink, and handle it with gloves and eye protection outdoors.
No Discard Rule Makes A Drink Safe, And The Old Reconciliation Is Withdrawn
If a node or a neighbour implies the product might be drunk, say plainly what this article is about: fuel. Earlier text here told the reader that, where the corpus’s pages disagreed, to “take the larger discard and the smaller fatal amount” as working numbers. That advice rested on the idea that a larger discard buys safety. It does not, so the advice is withdrawn: do not use any discard volume as a safety margin.
- Do not drink fuel alcohol, and do not hand it to anyone as a drink.
- If a community distils for drinking, use a grain or sugar wash, never fruit or pomace, and treat the early cut as a flavour step.
- Do not rely on the cut, on smell, or on how the first drink felt. None of them tells you how much methanol is in the bottle; the feedstock does.
Making Fuel Obviously Not Drink
- Denature it by adding something foul that also burns, such as a little gasoline or kerosene, enough that the smell is unmistakable. This discourages drinking but does not make it safe, and it is not a substitute for labelling.
- Label every container “FUEL – POISON – NOT FOR DRINKING” in the community’s language and with a mark that can be read without reading.
- Never use a drink bottle, and store apart from food.
If Someone Is Exposed
- Skin or splash: remove soaked clothing and wash with plenty of water for at least 15 minutes; flush eyes with clean water for 15 minutes.
- Vapour: move into fresh air.
- Swallowed, or suspected: treat it as an emergency at once and get the best medical help available; do not wait for symptoms, because they may not appear for 12 to 24 hours and can take up to 48, and by then the damage has begun. If the person also drank ethanol the onset can be later still. Blurred vision or a headache after contact is a reason to seek help, not to wait.
Methanol blinds, and the blindness is permanent
It passes through intact skin and evaporates easily, so skin, vapour and splash are all routes. Never measure or pour it with bare hands, never work with it without eye protection, and never in a closed room. Thin gloves are splash protection only and should be changed at once if wet.
What’s Next
- Learn next: Fire Safety, the other hazard of a fuel store
- Combine with: Biodiesel Production, which uses methanol as a reagent in far larger amounts