Using an expired perfume may not cause adverse reactions but may have an off smell. Perfumes can expire over time due to the oxidation process that occurs when the fragrance is exposed to air, causing the scent to become sour or have a metallic smell. The duration of a perfume's shelf life varies depending on factors like the ingredients and when it was opened. Typically, fragrance manufacturers advise throwing out a bottle after one to three years, but it's possible to use it for up to five years. The scent of a perfume won't necessarily fade, but oxygen exposure can cause oxidation, leading to sour, metallic, or plastic notes in the fragrance.
To ensure the longevity of your fragrance, it is essential to take care of it. Store your fragrance collection in a cupboard or drawer, avoiding exposure to light, heat, and humidity. It's recommended to finish using a perfume before the bottle is half empty to minimize the risk of alteration caused by increased oxygen. Applying the perfume correctly is also crucial. Instead of rubbing it on your pulse points, apply it to moist, damp skin to lock in the scent.
Unopened perfumes that are stored correctly in a cool, dry, and dark place can last for years, ranging from a few years to several decades, depending on the scent and storage conditions. However, once a bottle is opened, its longevity can range from three months to three years, based on the perfume's composition, packaging, and storage conditions. If a perfume has expired, it may cause skin irritation or discoloration of clothes, but this may vary from product to product. Before using an expired perfume, it is advisable to do a patch test and apply cautiously.
The top notes of a fragrance, such as citrus, fruits, and patchouli, are the most sensitive to oxidation. Fragrances with stable chemicals like woodsy notes, amber, and leather can last up to three years. The alcohol content in perfume plays a crucial role in its longevity. A higher alcohol content means that the fragrance is less likely to oxidize, and colognes or eau de toilettes with 90% alcohol tend to last longer.