Distilling faults, cloudiness, fusel notes
Spotting flaws
Not every unpleasant impression is simply a matter of taste. Some irregularities, such as cloudiness or fusel notes, point to genuine flaws in production or storage.
Cloudiness as an early warning sign
A clear gin should look glass-clear in the glass, with no streaks or particles. Cloudiness can have harmless causes, such as the so-called louche effect: certain oil-rich botanicals dissolve fully only in high-proof alcohol, and as soon as water or ice lowers the alcohol content, these oils become visible and the gin turns slightly milky. This is normal for certain botanical-heavy gins and not a flaw.
It's a different story when a gin already looks cloudy neat, without any water or ice, or even shows visible particles in the glass. This can point to a bottling error, contamination, or improper storage – such as extreme cold or prolonged direct sunlight. If you notice this in an unopened, factory-sealed bottle, don't simply dismiss it as "unusual" – it's worth critically checking whether something is wrong with that bottle.
Fusel notes and other distilling faults
Fusel notes arise when so-called fusel oils – higher alcohols that form as a byproduct of fermentation – aren't properly separated out during distillation. They smell and taste unpleasantly harsh, often solvent-like or reminiscent of nail polish remover, and completely mask the actual botanical aromas. A cleanly distilled gin shouldn't show such notes, no matter how bold or mild its juniper character otherwise is.
Another possible distilling fault is a burnt, scorched character, which can occur if temperatures were too high during distillation or if equipment wasn't properly cleaned. A plasticky or chemical smell also has no place in a good gin. Such impressions are rare in established brands but occasionally turn up in very cheap or poorly crafted bottlings.
How to tell a genuine flaw from personal taste
Not every gin you dislike actually has a flaw. Some people simply aren't fond of earthy, resinous juniper notes, while others find heavy citrus too sweet – that's purely a matter of personal taste and says nothing about quality. A genuine flaw, by contrast, shows up regardless of personal preference: cloudiness in a clear gin with no water added, a chemical or solvent-like character, or a sharpness that has nothing to do with ABV or spice but simply feels unclean.
When in doubt, comparison helps: if you try the same gin from a second, independently purchased bottle and get the same impression, it's most likely just the gin's actual style – not an isolated flaw. If the issue only shows up in one bottle, it's worth contacting the retailer or distillery, since something may genuinely have gone wrong during bottling or storage.
When storage is what creates the flaw
Not every flaw originates during distillation. Some issues arise purely from improper storage. Weeks of direct sunlight can alter aromas and make a gin taste flat. An open bottle that's been sitting around for a long time also gradually loses intensity, since alcohol and volatile aromas slowly evaporate over time, even through a well-fitted cap.
So if you taste an older, opened gin and find it weaker or duller than you remember, don't immediately assume a distilling fault. Often it's simply the passage of time. A bottle stored cool, dark, and well-sealed, on the other hand, holds its quality for years, since gin, as a high-proof spirit, is fundamentally very stable. A tightly fitting cap matters more than many people think – it often has a bigger impact on the shelf life of an opened bottle than the storage location itself.