There is a question that every fragrance enthusiast eventually asks, often after purchasing two bottles of the same perfume in different formats and discovering, with some surprise, that they don’t quite tell the same story. That question is one of concentration. Behind the abbreviations — EdC, EdT, EdP, Extrait — lies a precise alchemy that modifies not only a fragrance’s longevity, but its entire personality.
What Concentration Really Means
In its most technical definition, concentration refers to the percentage of aromatic compounds — the « concentrate » or « juice » — diluted in a solvent, typically ethyl alcohol. The higher the percentage, the denser, richer, and potentially more lasting the fragrance. But this equation is deceptively simple.
Eau de Cologne (2 to 5%) is the lightest concentration in the family. Born in Cologne in the eighteenth century around accords of citrus, herbs, and neroli, it was long synonymous with immediate freshness and ephemeral pleasure — the fragrance of aftershave, of a morning gesture. Its rapid volatility is not a flaw: it is an invitation to generosity, to layering, to repeated application.
Eau de Toilette (5 to 15%) remains the dominant market format today. Light without being fleeting, it deploys its top notes with brilliance before settling over the course of a few hours. It is often in this format that commercial perfumers conceive their canonical vision of a fragrance — the one that corresponds to what the house wishes to project first.
Eau de Parfum (15 to 20%) marks a qualitative turning point. The fragrance’s heart, its base notes — woods, resins, musks — take on a more assertive presence. The skin engages differently with the juice: body heat diffuses it more slowly, the sillage persists, and the olfactory transformation over the hours becomes more complex and legible.
Extrait de Parfum, or simply Parfum (20 to 40%), is the most concentrated and oldest form. Before the industrialisation of alcohol, precious essences lived in perfumed oils or animal fats. The modern Extrait reconnects with this density. It is not sprayed — it is deposited, drop by drop, on pulse points. It does not seek to fill a room: it creates an intimate atmosphere, a signature that belongs first to the skin of the wearer.
Perfume Oil: A Category of Its Own
Perfume oil (20 to 30% of aromatic compounds in a neutral vegetable or synthetic oil base) constitutes a distinct category from the above. The absence of alcohol radically changes the olfactory dynamic: without the alcoholic vehicle projecting molecules into the air, the fragrance stays closer to the skin, warmer, almost edible. Top notes evaporate less abruptly — the fragrance opens with greater softness, revealing its middle layers with patience.
Dry skin, which quickly absorbs alcohol, particularly benefits from oils: it retains the odorous molecules longer, sometimes creating a wear that surpasses even an Extrait. Conversely, naturally oilier skin may find the development slower, less airy.
What Concentration Changes in the Olfactory Narrative
The same accord can tell two very different stories depending on its concentration. Consider an iris fragrance: in Eau de Toilette, the iris will be powdery, almost evanescent, floating above a light structure. In Extrait, that same iris reveals its earthier, almost root-like layers — the carrot and buttery facets of the irone molecule, ordinarily masked, emerge with surprising frankness.
This is why several niche houses — and Maison Keïta is no exception — offer their creations in multiple concentrations, not as a commercial strategy, but because each format illuminates a different facet of the same diamond.
The Shift Toward Extraits and Oils in Niche Perfumery
Since the early 2010s, a marked shift in preference toward Extraits and oils has been observed within the niche segment. Several factors explain this movement.
First, a cultural dimension: in the perfumery traditions of the Middle East, India, and South-East Asia, oils and alcohol-free concentrates have always held a central place, for religious, climatic, and aesthetic reasons. The global rise of niche perfumery has naturally integrated these practices.
Then, an inverted economic logic: an oil or Extrait, being more concentrated, is used in smaller quantities. The cost per use often compensates for the higher listed price.
Finally — and this may be the most decisive factor — a search for intimacy. In a world where mass-market fragrance seeks to imprint its sillage on every room passed through, the niche enthusiast reclaims a fragrance that belongs to them — one that exists for themselves and for those they choose to let approach.
Choosing by Moment and Use
There is no absolute hierarchy among concentrations. There are affinities.
For a workday in a shared space, a light Eau de Toilette or a discreet Eau de Parfum respects the olfactory space of others. For a summer dinner on a terrace, an Extrait deposited on the wrist mingles with the heat of the night without aggressing. For a winter evening, an oil worn beneath clothing — on the sternum, in the hollow of the neck — creates an enveloping persistence that lasts until the following morning.
At Maison Keïta, certain creations exist exclusively in Extrait or oil format, because their architecture — dense, resinous, built on rare raw materials — found its full expression only through the slowness and intimacy specific to higher concentrations.
Concentration is not a technical detail. It is the tempo of a piece of music.