Expired Perfume — What Should You Do?

Does a perfume really have an expiry date?

An expired perfume remains usable in most cases, particularly if the flacon has been kept away from light and warmth. Degradation is gradual: oxidation, a change in scent, sometimes a shift in colour. A few simple signs help you tell a juice that's still good from one that's genuinely altered, before deciding whether to keep it or throw it away.

Unlike food products, a perfume doesn't carry a strictly mandatory expiry date. What you'll find on the packaging is a PAO — Period After Opening. It's shown as a small open jar symbol with a number: 12M, 24M, 36M. This means the manufacturer guarantees the product's stability for this length of time after first use.

Beyond this point, the perfume doesn't suddenly become dangerous. It may simply have developed — sometimes slightly, sometimes noticeably. It all depends on the composition, the storage conditions and the amount of air in the flacon.

How to recognise a perfume that has deteriorated

The deterioration of a perfume generally follows a fairly predictable pattern. The top notes disappear first — those light, volatile fragrances that create the first impression when sprayed. An aged juice may therefore seem heavier, woodier or more balsamic than originally, even if it isn't necessarily bad.

The most obvious sign remains the scent. An oxidised perfume often develops a sour, vinegary note, or one reminiscent of nail varnish. If this smell is strong and unpleasant, it's a clear indicator that the juice has turned. A slight development is normal; a radical transformation into a harsh smell is not.

The colour can also change. A juice that was originally pale or clear and has turned dark amber or brown has probably undergone significant oxidation. This happens particularly with perfumes containing citrus, aldehydes or certain natural materials sensitive to light and air. On the other hand, perfumes that are already coloured from the outset — such as certain deep orientals or juices incorporating resins — don't lend themselves as well to this visual test.

Finally, the texture of the liquid can change too. A juice that has thickened, or conversely appears cloudy for no obvious reason, deserves attention.

Why a perfume deteriorates — and how to prevent it

The number one enemy of a perfume is oxygen. Every time you press the spray, a small amount of air enters the flacon. The emptier the flacon, the greater the proportion of air, and the faster the oxidation. This is why a flacon that's half used up doesn't keep as well as a full one.

Light is the second factor behind deterioration. Ultraviolet rays degrade certain aromatic molecules, particularly in floral or citrus perfumes. Leaving a flacon in full sunlight on a windowsill is one of the most common — and most damaging — mistakes.

Warmth also plays a role. Temperature fluctuations weaken the composition and speed up unwanted chemical reactions. A poorly ventilated bathroom, with its spikes in temperature and humidity, is a particularly hostile environment for a perfume.

To store a perfume properly, the ideal spot remains somewhere cool, dark and at a stable temperature — a closed cupboard, a chest of drawers away from light, or even the fridge for very precious or rarely used juices.

Can you still use an expired perfume?

If the perfume has simply developed a different olfactory profile without a genuinely unpleasant smell, there's nothing stopping you from continuing to use it. The health risk is low for a healthy adult applying a perfume to the skin. Alcohol, present in large quantities in eaux de toilette and eaux de parfum, plays an important preservative role.

However, if the juice smells bad — really bad — or if your skin reacts after application (redness, itching), stop using it immediately. Certain degraded natural materials can cause irritation, though this remains rare.

Sensitive skin types or those prone to allergies should be more cautious. An altered perfume may develop compounds that weren't present in the original formula, which can further sensitise the skin.

What to actually do with an expired flacon

If the perfume is still usable but its profile has changed, you can simply adapt how you use it. Spray it onto clothing rather than directly onto the skin — the longevity will be different, but the risk of irritation is virtually nil. You can also use it to scent a drawer or cupboard, spraying it onto a piece of fabric or cotton wool.

If the juice is clearly altered and unusable, don't pour it down the sink or flush it down the toilet. Perfumes contain alcohol and chemical compounds that shouldn't enter wastewater untreated. Good practice is to take the flacon to a recycling centre or return it to a pharmacy if your local council offers this collection service.

Some old flacons, even empty ones, have value in their own right. Collectors are interested in vintage flacons from houses such as Guerlain, Lalique or Baccarat, and a well-preserved flacon can be worth something regardless of the juice it once contained.

Finally, if you're reluctant to throw away an expensive flacon but its smell seems questionable, there's nothing stopping you from keeping it as it is, closed, and reassessing the matter in a few weeks. Sometimes what seems altered on opening regains a certain coherence after a few minutes of airing.

The simplest rule remains this: if you still like the scent, keep using it with common sense. If it genuinely bothers you, move on to something else. A perfume exists above all to bring pleasure — expired or not, that's what has the final say.