20/08/2026
Why should you write the opening date on your fragrance oil bottles? ๐
Itโs very easy to open a bottle, use it a few times, shove it back to the back of your stash, and assume youโll remember when you first opened it.
Six months later, it somehow becomes "Was this opened in Februaryโฆor was it the February before?โ ๐คฃ
Writing the opening date on the bottle gives you a clear record of how long your fragrance oil has been exposed to air and helps you keep track of its age, condition, and performance.
Why does opening the bottle matter?
Fragrance oils are made from many different aromatic materials. Once the bottle is opened, the oil is repeatedly exposed to:
โจ Air
โจ Light
โจ Temperature changes
โจ Moisture
โจ Possible contamination during use
Over time, this can affect the fragrance through a process called oxidation. Some materials are more sensitive than others, particularly certain citrus, fresh, green and delicate top notes.
The fragrance oil may gradually:
โจ Smell weaker or less balanced
โจ Lose some of its lighter top notes
โจ Become darker in colour
โจ Become thicker
โจ Develop a slightly different scent
โจ Perform differently in the finished product
This doesnโt mean that every fragrance suddenly becomes unusable on a particular date. Fragrance oils all age differently, and the way they have been stored makes a huge difference.
Does fragrance oil expire after 24 months?
The shelf life commonly given for fragrance oils is 24 months, but this is not a magical expiry date where the oil suddenly becomes unusable the following day.
There is absolutely no reason why you can't use a fragrance oil that is much older than 24 months if it has been stored correctly and is still performing as it should.
Some oils remain perfectly usable for years, while others - particularly those containing more delicate or volatile materials - may not.
The opening date is therefore there to help you monitor the oil, not to tell you that it must automatically be thrown away once it reaches two years old.
If you want to use an older fragrance oil, make a small test product first rather than committing it to a full batch.
Check things like:
โจ Does the fragrance still smell as it should?
โจ Has its colour changed significantly?
โจ Has its consistency changed?
โจ Is the cold throw still good on your test batch?
โจ Does it still perform properly when warmed or burned?
โจ Are you still happy with the overall strength and character?
If the oil has changed slightly but you're still happy with its scent, safety information and performance, there may be no reason not to use it.
However, donโt try to compensate for a poorly performing older oil by simply adding more. You must still remain within the limits of your wax or base and the maximum permitted usage rate for the relevant product category on the IFRA.
Make sure you still have the regulatory documentation before using an older fragrance oil in products you intend to sell, for that exact oil. You'll need the relevant information to ensure your finished product is correctly assessed and your CLP label is accurate.
If the fragrance oil has since been discontinued, renamed or removed from the supplierโs website, the documents may no longer be as easy to find. This is why you should download and keep copies of documentation when you purchase the oil rather than assuming it will remain online forever.
You should also check whether the fragrance or its documentation has been updated since you bought it. If the formulation has changed, the current documents may not necessarily relate to your older bottle.
Where possible, retain:
โจ Safety Data Sheet (SDS)
โจ IFRA Certificate
โจ Allergen Declaration
โจ Any relevant CLP templates
โจ The batch number from your bottle
An older fragrance oil might still smell and perform beautifully, but if you no longer have the correct information needed to classify and label the finished product, that creates a separate compliance problem.
If you have several bottles of the same fragrance, clearly dating them helps you use the oldest suitable bottle first - often called "first in, first out".
Otherwise, itโs very easy to keep reaching for the newest bottle while an older one sits forgotten at the back of the shelf.
For better stock control, you could record:
โจThe date received
โจ The date opened
โจ The batch number
A simple sticky label or permanent marker is enough. It doesnโt need to become another complicated spreadsheet unless, like me, you enjoy turning absolutely everything into one ๐ค
Writing the date on the bottle wonโt protect the oil if itโs stored badly.
Fragrance oils should generally be kept:
โจ Away from direct sunlight
โจ In a cool place with a stable temperature
โจ In their original, suitable container
โจ With the lid closed tightly
โจ Away from moisture and contamination
Avoid leaving bottles open while making, and donโt pour used or leftover oil back into the original bottle. Use clean equipment every time and keep the bottle neck and lid clean.
If you decant fragrance into smaller bottles, label those too. Include the fragrance name, supplier, batch information and decanting or opening date so the oil can still be identified and traced.
So, in simple terms - The commonly stated 24 month shelf life is guidance - not an automatic expiry date.
Writing the opening date helps you monitor the oilโs age, rotate your stock and spot any changes. If an oil is older, make a small test batch first to ensure youโre still happy with its scent and performance, and make sure you still have the correct regulatory documentation needed for your finished product and CLP labels.
It takes about five seconds when you first open the bottle - and saves you from playing โHow long has this been here?โ several months or years later ๐
Shout out to Lusia for this Q&A suggestion ๐ซถ
