Beneath the name on most fragrance bottles there is a second, smaller line: eau de toilette, eau de parfum, parfum, extrait. These terms describe the concentration of a fragrance — roughly, how much of the perfume oil is present compared with the alcohol and water it is diluted in. They are useful, but they are also frequently misunderstood. This guide explains what they usually mean and what they can and cannot tell you.
What concentration means
A finished fragrance is usually a blend of perfume concentrate — the composition of fragrance materials — diluted in a carrier, most often alcohol, sometimes with a little water. The dilution makes the fragrance easier to apply, helps it diffuse from the skin, and brings the materials to a strength that is pleasant to wear.
The proportion of concentrate to carrier is what the terms on the bottle refer to. More concentrate generally means a richer, longer-lasting fragrance; less means a lighter one.
The common terms
The figures below are ranges commonly cited in the industry. They are approximate. There is no single universal standard, and different houses use different proportions — so treat them as a guide to the general idea, not as precise definitions.
- Eau de cologne — the lightest, often in the region of a few percent. Traditionally fresh and citrus-led, and quick to fade.
- Eau de toilette — light to moderate, commonly cited at roughly five to fifteen percent. Bright, easy to wear, often with a lively opening.
- Eau de parfum — richer, commonly cited at roughly fifteen to twenty percent. Usually longer-lasting, with a fuller heart and base.
- Parfum or extrait de parfum — the most concentrated, often twenty percent or more. Rich, close to the skin, and typically the longest-lasting.
Some houses use other terms as well, such as "parfum de toilette", "eau fraîche" or "elixir". Their meanings vary more from one brand to another.
The line on the bottle tells you how a fragrance was diluted, not how it will behave on you.
What concentration changes
Longevity
Higher concentration often means a fragrance lasts longer on skin, simply because there is more of it. But longevity also depends heavily on the materials in the composition. A light eau de toilette built on a strong woody base may outlast an eau de parfum built mostly on fleeting citrus.
Projection and closeness
It is natural to assume that a stronger concentration projects further, but this is not always so. Many extraits sit close to the skin, creating a dense, intimate aura, while some lighter concentrations — with more alcohol to carry them — can feel more diffusive in the first hour. Concentration affects richness at least as much as reach.
Character
The same fragrance name at two concentrations is often not the same perfume diluted differently. Many houses adjust the composition itself for each version, changing the balance of notes to suit the concentration. An eau de toilette might emphasise the fresh opening; the eau de parfum of the same name might deepen the base. It is worth smelling each version rather than assuming one is simply a stronger copy of the other.
What it does not tell you
- Quality. A higher concentration is not a mark of a better fragrance. A beautifully composed eau de toilette can be more satisfying than an unremarkable extrait.
- Value. Because extraits contain more concentrate, they are often priced higher, and a little goes a long way. Whether that is better value depends on how you wear fragrance.
- Your experience. As we discuss in Why Skin Changes a Perfume, your skin, the weather and how you apply it can matter as much as concentration.
Choosing between them
A few questions may help:
- How long do you want it to last? For a long day without reapplying, a richer concentration is often easier.
- How close do you want it to sit? For a quiet, personal fragrance, an extrait applied lightly can be lovely. For a lively opening that others notice, a lighter concentration may suit.
- When will you wear it? Some people prefer lighter concentrations in heat and richer ones in cooler months.
- Which version do you prefer? If a fragrance comes in several concentrations, try them side by side on skin. You may simply like one better — and that is reason enough.
In the RUŌOD collection, each perfume states its concentration beside its size, so you know what you are choosing. The rest, as always, is best discovered on skin.
