Production date is not an expiry date
The batch checker interprets a manufacturing mark. It cannot observe exposure to heat, light, air, or handling. A recent bottle may have been stored poorly, while age alone does not establish the condition of an older one. FDA’s general cosmetics guidance describes shelf life as product-, use-, and storage-dependent.
Save a decoded date as part of a bottle record, with its confidence and the check date. Do not turn it into an “expires on” label by adding an assumed number of years. Our methodology explains what the estimate supports.
Unopened and opened bottles need different records
For an unopened bottle, note the purchase date and what is known about storage. Sealed packaging does not reveal the warehouse or transport history. For an opened bottle, record when it was opened, any decanting or refilling, and changes you notice. A factory batch mark does not record the opening date.
In a resale listing, “new” may mean unused rather than recently manufactured. Ask the seller which meaning they intend and consult the secondhand buying checklist.
What 24M or 36M means
Where an open-jar period-after-opening symbol is supplied, a marking such as 24M refers to months after opening, not months from production. It is separate from a manufacturing code. Cosmetics Europe’s label guide also explains that some products, including some perfumes, do not require these durability labels. Absence of that symbol does not establish that a fragrance is counterfeit.
Read the actual product label and manufacturer instructions. Do not assume a symbol on one product or market applies to a different formulation.
A practical storage checklist
- Choose a dark place with a stable temperature, away from direct sun and heat sources.
- Keep the closure secure. Avoid unnecessary opening or transferring the contents.
- Store upright, keep the carton dry, and preserve marks without adhesive or cleaner.
- Avoid windowsills, hot cars, and places with repeated heat or moisture swings.
CHANEL’s fragrance FAQ identifies heat, air, and light as storage concerns and recommends a tightly closed bottle, with original packaging useful in bright surroundings. These precautions provide context, not a guarantee for every fragrance.
When the fragrance seems different
Record an unexpected change in smell, color, leakage, or spray behavior and review the product’s instructions. A color change or a weak spray does not reveal a single cause. Storage, formulation changes, the mechanism, and your comparison conditions may all matter; the batch checker cannot distinguish them.
Do not infer a fixed shelf life from fragrance families such as citrus or woods. If an unexplained change raises a product concern, pause use and ask the manufacturer. ScentDecoder does not laboratory-test liquid or assess suitability for use.
Find the mark, estimate production time, and retain the authenticity limits alongside the result.
Frequently asked questions
Does perfume expire?
Fragrance can change or deteriorate, but a batch code alone cannot establish a universal expiry date. Follow product-specific manufacturer instructions and consider storage history.
Is an old batch code automatically bad?
No. The production period and condition are different questions. A date does not establish storage conditions or how the bottle was handled.
Should I discard a bottle based only on a decoded date?
A decoded production date alone cannot decide suitability for use. Follow applicable product instructions and ask the manufacturer about uncertainty or unusual changes.
Does High confidence mean the fragrance is fresh?
No. Confidence describes the decoding evidence only. It does not measure freshness, authenticity, safety, or the condition of the liquid.