Concentration is the single most useful number on a perfume bottle, and almost nobody explains it clearly. It tells you how much of what you are actually smelling is real fragrance material, and how much is carrier. Once you understand it, choosing between a perfume oil, an eau de parfum and an eau de toilette becomes far less mysterious.
Here is what the numbers mean, why perfume oils sit near the top of the scale, and how to read a label properly before you commit to a full bottle.
What concentration actually means
Every fragrance is a mixture of two things. Aromatic compounds, which are what you smell, and a carrier, which is what delivers them to your skin. Concentration is the percentage of that mixture made up of the aromatic compounds. The higher the percentage, the more actual fragrance you are getting per drop, and the longer it tends to wear.
That is the entire concept. The rest is just categories that different formats sit within.
The standard concentration bands
| Format | Concentration | Carrier | Typical wear |
|---|---|---|---|
| Eau fraiche | 1 to 3% | Alcohol and water | 1 to 2 hours |
| Eau de cologne | 2 to 5% | Alcohol | 2 to 3 hours |
| Eau de toilette | 5 to 15% | Alcohol | 3 to 5 hours |
| Eau de parfum | 15 to 20% | Alcohol | 6 to 10 hours |
| Parfum, or extrait | 20 to 30% | Alcohol | 8 to 12 hours |
| Perfume oil | 15 to 30% typically, higher in some artisan formulations | Carrier oil, no alcohol | At least 12 hours, a full day and beyond |
Two things worth noticing. Perfume oils sit at the concentrated end of the scale, comparable to a pure parfum in aromatic content. And unlike every other category on the list, they use an oil rather than alcohol as the carrier, which is why they wear so differently on skin.
Why higher concentration is not automatically better
People assume more concentration means more of everything. That is true for longevity but not for projection. A 25% concentrated perfume oil will hold on skin all day, but it stays close to the body. A 15% eau de parfum will project more strongly across a room in the first hour, then fade faster.
Concentration governs how much aromatic material is on your skin. Format, meaning whether it is oil or alcohol based, governs how that material behaves. Once you separate the two, the trade-offs make sense.
A spray with alcohol lifts fragrance into the air and gives you presence, at the cost of longevity. An oil with no alcohol releases gradually and stays close, giving you all day wear at the cost of projection. Neither is objectively better. They serve different moments.
Why perfume oils typically outlast their concentration would suggest
If you compare a 20% concentrated eau de parfum and a 20% concentrated perfume oil, the oil will genuinely wear longer on the skin. The reason is not the concentration figure, it is what the carrier is doing.
Alcohol is volatile. Even at high concentration, an eau de parfum loses a proportion of its aromatic material to evaporation in the first hour. That is the dramatic opening you can smell as you spray, and it is fragrance leaving your skin and going into the air. An oil has nothing to evaporate. Every drop of aromatic material stays on the skin, releasing slowly as your body warms it.
This is why our alcohol-free perfume oils wear at least 12 hours from a single morning dab. It is not that the concentration is dramatically higher than a good eau de parfum. It is that none of the fragrance is being wasted into the air.
How to read a real label
Most UK fragrance labels do not print the exact percentage, but you can work it out.
Format on the front tells you the band. If the bottle says eau de parfum, expect 15 to 20%. Eau de toilette, 5 to 15%. Parfum or extrait, 20 to 30%.
Ingredient list on the back tells you the carrier. If ethanol, alcohol denat., ethyl alcohol or SD alcohol is the first ingredient, it is an alcohol-based fragrance. If a carrier oil such as fractionated coconut oil, jojoba oil or sweet almond oil is the first ingredient, it is a perfume oil.
Bottle size gives you a hint about how the maker expects you to use it. Perfume oils typically come in 10ml or 15ml because a dab lasts longer than a spray. Sprays come in 50 to 100ml because you use more per application. If you see a 100ml perfume oil, be a little skeptical about the concentration.
What we make and where it sits on this scale
Every one of our perfume oils is highly concentrated, alcohol-free, and worn by the dab. They sit in the 20% and above range in aromatic content, which is why they hold at least 12 hours on skin from a single application. Produced in small batches and finished in the UK using internationally sourced ingredients.
Our range covers the Arabian palette, oud, saffron, damask rose, musk. For a rose and oud entry point, Golden Rose is where most people start. For an eau de parfum with oud at the base and proper projection for evenings, our luxury oud perfume Exotic Oud sits in the 15 to 20% eau de parfum band, alcohol based, made to be noticed.
Sit them side by side and you can feel the difference concentration and carrier make. The oil is quieter but stays with you all day. The eau de parfum announces you but softens by evening. Most people who take fragrance seriously end up wearing both, one for daytime and one for occasions.
Where the tradition sits within this
The attar perfume tradition understood concentration and carrier better than modern Western perfumery, several centuries earlier. Attars were highly concentrated by default, worn by the dab, and used oil as the carrier. The reason they lasted all day was exactly what we are describing here, without anyone needing to print a percentage on a label.
Which concentration is right for you
If you want a fragrance that quietly stays with you from morning to night, that suits sensitive skin, and that fits in a bag, choose a perfume oil. If you want a fragrance that announces you the moment you enter a room, and you do not mind topping it up in the afternoon, choose an eau de parfum. If you want something light for a hot day that will not overwhelm anyone, an eau de toilette does the job.
If you are not sure, the honest answer is to try a few. Our discovery set gives you small vials of the range to wear on your own skin for a few days each. Fragrance behaves differently on everyone and reading about concentration only takes you so far. The dry down on your own skin, at four in the afternoon, is what tells you which format actually suits you.
Once you know that, everything else falls into place.