Anisha Riggs
Perfumes are designed to change scent over time, with top, middle, and base notes emerging as the liquid oxidizes. However, perfumes can expire, and applying an expired perfume could result in an unpleasant smell, skin irritation, or an allergic reaction. Expired perfumes may smell vinegary, sour, or like celery, old wood, or overripe fruit. They may also appear darker in colour or have a yellow tint. While some perfumes can last upwards of 10 years, an open fragrance will typically last about two years.
| Characteristics | Values |
|---|---|
| Reasons for smell change | Oxidation, evaporation, exposure to oxygen, vegetable oils expiring |
| How to identify if perfume is expired | Smell, appearance, expiration dates, colour, consistency |
| Examples of smell change | Sour, metallic, celery, curry, mould, alcohol, mildew, old wood, overripe fruit, funky spices |
| Average lifespan of an open fragrance bottle | 2 years |
| Average lifespan of an unopened fragrance bottle | Several years |
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What You'll Learn
Perfumes expire, but at different rates
Perfumes do expire, but the rate at which this happens depends on various factors. Firstly, the chemical composition of a perfume plays a significant role in its longevity. Scents containing vegetable oils, for example, are known to expire faster than those with no fat content, such as essential oils. Additionally, perfumes with spicy, woody, or vanilla notes tend to have a longer shelf life due to the structural stability of their natural ingredients.
Secondly, exposure to oxygen accelerates the expiration process. When a perfume is sprayed, oxygen enters the bottle and begins to oxidize the fragrance, reducing its potency over time. This is why an unopened bottle of perfume can last several years, while an open bottle typically lasts around two years. The artistry of distilling and perfume-making comes into play here, as perfumers can design their products to be at their best once exposed to more air, enhancing the experience for the user.
The quality and storage methods of a fragrance also impact its expiration date. High-quality perfumes can last for years if stored correctly, while cheaper fragrances designed for mass consumption may not have the same longevity. Proper storage can help extend the lifespan of a perfume, such as keeping it in a cool, dark place or even refrigerating it.
Lastly, the appearance of a perfume can provide clues about its expiration. Discoloration, such as a darker hue or a yellow tint, often indicates that a perfume has oxidized and expired. An expired perfume may also have a reduced volume in the bottle due to evaporation, especially if it contains a high concentration of alcohol.
In summary, while perfumes do expire, the rate at which this occurs varies depending on their chemical composition, exposure to oxygen, quality, storage methods, and visual indicators of expiration.
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Oxidation changes the scent
Perfumes are complex mixtures of various chemical compounds, and these compounds can be affected by oxidation. The oxidation of a perfume can result in a change in its scent, making it smell different from when it was first purchased. This is because oxidation can cause the breakdown of the original scent molecules, forming new molecules with different odours.
Additionally, oxidation can also affect the potency of a perfume, causing it to lose its strength over time. This is why some perfumes that have been stored for a long time may seem to have a weaker scent or may not smell like anything at all.
The oxidation process can also cause a change in the colour of the perfume, turning it darker. This colour change is due to the chemical reactions occurring between the perfume compounds and oxygen.
To slow down the oxidation process and preserve the scent of a perfume, it is recommended to store the bottle in a cool, dark place and avoid exposing it to direct sunlight or heat.
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Some perfumes are designed to change scent with use
Perfumes are composed of three structural parts: the head, middle, and base notes. The head note, or top note, produces the initial scent and forms the first impression of the perfume. It is composed of small light molecules that have a strong, fresh scent but evaporate quickly, usually 5 to 30 minutes after application. The middle note, or heart note, emerges once the head note evaporates, and forms the "body" of the perfume. The base note provides the lasting impression of the fragrance. Common base notes include cedarwood, sandalwood, vanilla, amber, patchouli, oakmoss, and musk. These base notes can last over 24 hours after application.
The process of creating a perfume involves the collection, extraction, blending, and ageing of the product. The ageing period allows the ongoing blending of the selected chemicals to modify the scent. A good perfumer or distiller understands that the smell of a brand new product will be different from the majority of the user's experience. As more perfume is used, it is exposed to more oxygen, which can change the scent. Perfumers can design their product to be at its best once exposed to more air. This is why a small spray on the skin will change over time and you get top, middle, and base notes—it is the liquid oxidizing off your skin.
Some perfumes may be designed to change scent with use, but perfumes can also expire. If a perfume expires, applying it could result in an unpleasant smell, skin irritation, or an allergic reaction. Signs that a perfume has expired include a vinegar smell, a significant change in the concentration of the original scent, a change in colour, or a reduction in the volume of liquid in the bottle.
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How to test if a perfume has expired
Perfumes can indeed expire, and using expired perfumes can result in an unpleasant smell, skin irritation, or even an allergic reaction. The quality, scent family, and storage method can impact a perfume's longevity. Here are some ways to test if your perfume has expired:
Check the scent
The most obvious way to tell if your perfume has gone bad is to test its scent. If the perfume smells of vinegar or alcohol, or if the concentration of the original scent has changed significantly, it has likely expired. Expired perfumes may also smell dull or sour, lacking their original potency.
Examine the appearance
Check the colour of the liquid inside the bottle. If the perfume has become darker, opaque, or amber in colour, it may be expired. Scents with high alcohol concentrations tend to evaporate over time, resulting in a lower volume of liquid in the bottle.
Refer to the expiration date
Most perfume bottles have an expiration date printed on the bottom or the packaging. Look for a batch code or a PAO (Period After Opening) number to determine the expected lifespan of the perfume.
Store appropriately
To prolong the lifespan of your perfume, store it in a cool, dry place away from direct sunlight and humidity. The bathroom, for example, may not be an ideal storage location due to the increased humidity.
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Spoiled perfumes smell similar
Perfumes are designed to be at their best once exposed to air. However, as perfumes are exposed to more and more oxygen, they will eventually expire. Many perfumes, especially those from well-respected brands, do not have a hard-and-fast expiration date. Some will begin to expire in less than a year, while others will last upwards of 10 years.
Spoiled perfumes often share a similar smell, regardless of their original ingredients. They tend to have a fausty, musty, and mouldy smell, similar to curry, sweaty onions, or body odour, with an alcoholic sting. This smell may be due to the degradation of natural ingredients in the perfume. Some perfumes may also smell like vinegar or have a significant change in concentration.
Some people may not notice the difference in smell between a fresh and a spoiled perfume. In addition, some perfumes may be disliked for their regular scent, rather than because they have turned.
It is important to test a perfume before use if it is a couple of years old, as using expired perfume could result in an unpleasant smell, skin irritation, or an allergic reaction.
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Frequently asked questions
Yes, old perfumes smell different because they are exposed to oxygen, which can alter the molecules in the fragrance.
An open fragrance can last about two years. An unopened bottle can last several years depending on how it is stored.
You can test the perfume by spraying it on a piece of paper to see if you detect any off-notes. You can also check if the colour of the perfume has changed.
Expired perfumes can smell sour and weathered, like old wood and overripe fruit. They can also smell like vinegar, celery, or funky spices.
Perfumes expire due to the oxidation of certain compounds within the fragrance. This can be accelerated by exposure to oxygen.
