Heads, Hearts, Tails

Part of Alcohol and Distillation

Understanding distillation fractions and how to make safe, clean cuts between them.

Why This Matters

Every batch of fermented wash contains not just ethanol and water but dozens of other compounds: methanol, acetone, ethyl acetate, fusel alcohols, aldehydes, and esters. Some of these are harmless flavor compounds. Others are toxic. During distillation, these compounds come over at different points based on their boiling points and their affinity for ethanol and water.

The art of distillation is knowing exactly when to switch collection vessels, separating the dangerous foreshots from the desirable hearts, and stopping before the unpleasant tails contaminate your product. Get this wrong and you either produce toxic spirits that can cause blindness or death, or you produce harsh, headache-inducing liquor that nobody wants to drink.

This skill cannot be learned from a book alone; it requires practice and sensory training. But understanding the science behind fraction separation provides the framework within which your practical skills develop. This article gives you both the theory and the practical methods to make clean, safe cuts.

The Four Fractions

Foreshots

The foreshots are the very first liquid to emerge from the condenser. They contain the highest concentration of the most volatile and most dangerous compounds.

Compound	Boiling Point	Danger
Acetone	56C	Toxic, harsh
Methanol	65C	Blindness, death
Ethyl formate	54C	Toxic
Acetaldehyde	20C	Toxic, harsh

Volume: Roughly 50ml per 20 liters of wash, or about 1-2% of total distillate volume.

How to identify: Foreshots smell sharply chemical, like nail polish remover or paint thinner. There is no subtlety; the smell is immediately, obviously wrong. If you wet your finger and smell the first drops from a still, the harsh chemical odor is unmistakable.

What to do: Discard foreshots completely. Pour them into a separate container labeled “POISON” or “SOLVENT ONLY.” They can be used as fire starter, degreasing solvent, or cleaning agent, but must never be consumed.

Methanol Poisoning

As little as 10ml of methanol can cause permanent blindness. 30ml can be fatal. Methanol poisoning symptoms (headache, nausea, vision problems) may not appear for 12-24 hours after ingestion, by which time organ damage is already occurring. ALWAYS discard foreshots. There is no safe shortcut.

Heads

After the foreshots, the distillate transitions into the heads fraction. Heads contain a mixture of ethanol with lighter alcohols and volatile esters. The transition from foreshots to heads is gradual, not a sharp line.

Compounds present: Ethyl acetate (fruity/solvent), acetaldehyde (green apple/sharp), light esters, and residual methanol in decreasing concentration.

Volume: Approximately 200-500ml per 20-liter wash, or 5-10% of total distillate.

How to identify: Heads smell sharp, solvent-like, and aggressive. As you progress through the heads, the harshness gradually fades. The smell transitions from “nail polish” to “slightly sharp ethanol” to “clean spirit.”

What to do: Collect heads separately. They are not dangerous in the way foreshots are, but they contain compounds that cause harsh flavors and hangovers. Experienced distillers save heads and add them back to the next batch of wash before redistillation. This recovers the ethanol they contain while allowing another chance to separate the unwanted compounds.

Hearts

The hearts fraction is your target product. This is clean, well-separated ethanol with pleasant flavors and no dangerous compounds.

Characteristics of good hearts:

• Smell: Clean, warm, smooth. For fruit brandies, you may detect the source fruit. For grain spirits, a clean grain sweetness. No sharpness, no solvent notes.
• Taste: A tiny drop on the tongue burns cleanly and evenly, with a pleasant warmth that fades. No bitterness, no harshness, no oily sensation.
• Appearance: Crystal clear. Any cloudiness indicates contamination from heads or tails.
• Temperature: Column or vapor temperature steady between 78-85C.

Volume: For a well-run pot still, hearts represent 30-50% of total distillate volume. A 20-liter wash at 10% ABV might yield 1-2 liters of hearts at 55-65% ABV on a first run.

Tails

As the ethanol in the wash depletes, heavier compounds begin to dominate the distillate. These are the tails (also called feints).

Compounds present: Fusel alcohols (amyl alcohol, isobutanol, propanol), furfural, acetic acid, and increasing amounts of water. Fusel alcohols have boiling points between 100-140C but are carried over in the vapor as azeotropes with ethanol and water.

How to identify:

• Smell: Wet cardboard, oily, musty, sometimes described as “wet dog” or “old socks”
• Taste: Harsh, bitter, oily coating on the mouth
• Appearance: May become slightly cloudy or oily
• Temperature: Column temperature rises above 88-92C

What to do: Collect tails separately, same as heads. Add them to the next batch for redistillation. Tails contain significant amounts of ethanol (often 20-40% ABV) that would be wasteful to discard.

Making the Cuts

The Heads-to-Hearts Cut

This is the most critical decision in distillation. Cut too early and you waste good hearts in the heads jar. Cut too late and heads compounds contaminate your product.

Methods for determining the cut point:

1. Smell test (primary method): Continuously smell small samples of distillate on the back of your hand or on a spoon. The transition from heads to hearts is marked by a change from sharp/solvent to clean/smooth. When the harshness disappears completely, you have reached hearts.

2. Temperature: When column temperature stabilizes at 78-80C and stops fluctuating, you have typically passed through the heads. The fluctuation during heads is caused by the varying boiling points of the mixture of compounds.

3. Volume-based estimate: For a known-volume wash, discard a calculated percentage. A conservative approach: discard the first 10% of total expected distillate as foreshots + heads combined.

4. Rubbing test: Place a few drops on your palms and rub them together vigorously until the liquid evaporates. Smell your palms. Heads leave a sharp, chemical residue smell. Hearts leave a clean, pleasant smell or no smell at all.

The Hearts-to-Tails Cut

This cut determines the character of your final product. A tight cut (switching early to tails) produces a lighter, cleaner spirit. A loose cut (continuing to collect hearts longer) produces a heavier, more flavorful spirit with more body.

Methods for determining the cut point:

1. Smell and taste: As above, continuously monitor. When you detect the first oily, cardboard, or musty notes, switch to the tails container.

2. Temperature: When column temperature consistently rises above 88-92C, tails are dominating.

3. Burn test: Collect a small sample on a spoon and ignite it. Hearts burn with a clean, steady blue flame. As tails increase, the flame becomes weak, sputtery, and may self-extinguish. When the sample will not sustain a flame, you are well into tails.

4. Proof measurement: If you have a hydrometer or alcoholmeter, hearts typically come over at 55-70% ABV on a first run. When the proof drops below 45-50%, you are entering tails territory.

The Jar Method

The most reliable technique for making clean cuts is the jar method. Instead of making real-time decisions about when to switch containers, collect the entire distillation run in a series of small, numbered jars (200-500ml each).

1. Set up 10-20 jars in sequence.
2. Collect the distillate sequentially, filling one jar at a time.
3. After the run is complete, smell and taste each jar individually.
4. Group the jars: foreshots (discard), heads (save for next batch), hearts (keep), tails (save for next batch).
5. Combine all hearts jars into your final product container.

This method allows you to make cut decisions without time pressure, compare fractions side by side, and even redistribute borderline jars on subsequent evaluation.

Jar-by-Jar Evaluation

For a typical 20-liter wash distilled into 15 jars of 200ml each:

Jar	Typical Character	Classification
1	Extremely harsh, chemical, nail polish	Foreshots - DISCARD
2	Sharp, solvent-like, aggressive	Heads
3	Moderately sharp, transitioning	Heads
4	Mildly sharp, mostly clean	Late heads / early hearts
5-9	Clean, smooth, pleasant	Hearts
10-11	Slightly heavier, more body	Late hearts
12	First hints of oiliness	Borderline hearts/tails
13-14	Oily, cardboard, harsh	Tails
15	Very harsh, watery	Late tails

Jar 4 and jar 12 are the borderline jars. Include them in hearts for a bolder spirit, or exclude them for a cleaner one. With experience, you will develop a personal preference.

Recycling Heads and Tails

Never discard heads or tails (except foreshots). They contain valuable ethanol that can be recovered:

Method 1: Add to next batch. Pour saved heads and tails directly into your next batch of wash before distillation. The ethanol they contain boosts the wash strength, and you get another opportunity to separate the unwanted compounds cleanly.

Method 2: Feints run. Accumulate heads and tails from multiple runs until you have enough to fill a still charge. Distill this collection, called a “feints run.” The resulting hearts from a feints run are often surprisingly clean because the compounds have been through multiple separations.

Method 3: Fuel grade. If you have excess heads and tails and do not want to recycle them into drinking spirits, combine them for use as fuel, solvent, or cleaning agent. The compounds that make them unpleasant to drink are irrelevant for non-consumption uses.

Developing Your Palate

Making good cuts is fundamentally a sensory skill. Train yourself systematically:

• Smell practice: Expose yourself to pure compounds when possible. Nail polish remover is mostly acetone; rubbing alcohol is isopropanol (similar to fusel alcohols). Learn to recognize these notes.
• Comparative tasting: When evaluating jar collections, always taste jars in sequence from first to last. The transitions become obvious with practice.
• Record keeping: Note the volume at which you made each cut, along with temperatures if available. Over time, patterns emerge for each type of wash.
• Get a second opinion: Have another experienced person evaluate your jars independently. Comparing assessments sharpens both your skills.

After 5-10 distillation runs with careful jar evaluation, most people develop reliable cut-making ability. After 20-30 runs, it becomes nearly automatic.