The essentials
Dilution, often called concentration, is the percentage of aromatic concentrate dissolved in the alcohol and water base of a perfume. The aromatic concentrate is the perfumer's formula proper, made of essential oils, absolutes, synthetic molecules, and tinctures. The base is a perfumer's alcohol (denatured ethanol) with a small share of demineralised water, depending on the desired feel and stability (Perfumer & Flavorist, accessed 2026-05-29).
Standard categories follow industry conventions: Extrait de Parfum at 20 to 40 %, Eau de Parfum at 15 to 20 %, Eau de Toilette at 8 to 12 %, Eau de Cologne at 2 to 4 %, and lighter mists below 3 %. These ranges affect longevity, projection, and base note expression, but they are not legally enforced thresholds. They reflect long-standing trade practice rather than regulation.
The practical consequence for a wearer is that a higher dilution does not just amplify the same smell. It changes the balance between top, heart, and base, and the way the fragrance evolves on skin. Niche perfumery has rediscovered the higher end of the scale over the last two decades, with several houses presenting Extrait versions as the definitive expression of a composition (Bois de Jasmin, accessed 2026-05-29).
Concentration categories and their conventions
The category names date back to the 19th and early 20th centuries and have been used in a relatively consistent way by mainstream and niche houses. Extrait de Parfum, often labelled Parfum, sits at 20 to 40 % of aromatic concentrate and delivers the deepest base note expression and the longest wear. Eau de Parfum, the dominant niche format today, sits at 15 to 20 % and balances projection and longevity. Eau de Toilette runs at 8 to 12 %, with a lighter, more transparent feel and a stronger top note phase. Eau de Cologne, in the traditional sense, runs at 2 to 4 % and is built around citrus and aromatic accords for a fresh, brief experience.
The labels are conventions, not regulated definitions. A house can call a 12 % formula an Eau de Parfum without breaching EU cosmetics regulation. Most established houses respect the standard ranges, which is why the categories remain a useful starting point for setting expectations before testing.
How concentration shifts the olfactive experience
Higher concentration does not simply increase volume. With more aromatic material per millilitre, the base notes carry significantly more weight, which is why musks, sandalwood, amber, and resins feel deeper and longer-lasting in an Extrait than in the corresponding Eau de Toilette. The top notes can read as more discreet in a very concentrated formula, because the volume of heart and base materials covers part of the citrus and aldehyde opening.
The drydown also stretches in time and in detail. Where a 10 % Eau de Toilette might settle into its base within two to three hours, a 25 % Extrait often takes five to seven hours to reach the same phase, and reveals secondary notes along the way. Wearers who enjoy following a composition through its development tend to prefer concentrated formats for that reason.
When concentration variants are different formulas
Several houses release the same fragrance name in two or three concentrations that differ in more than just dilution. The Eau de Parfum and Extrait of a classic composition are often genuinely distinct formulas, with adjusted material ratios to keep the balance correct at each strength. This is especially common in long-running classics that have been reformulated several times to comply with IFRA Standards (IFRA, accessed 2026-05-29).
Before assuming that the Extrait is simply a stronger version of the EDP you already own, it is worth reading specific side-by-side reviews on Fragrantica, Basenotes, or Parfumo. A perfume community comparison anchored to specific batch codes will tell you whether the variants are genuinely different formulas or only different dilutions of the same concentrate.
The Extrait revival in niche perfumery
The Extrait format declined sharply in the second half of the 20th century, when Eau de Toilette and then Eau de Parfum became the commercial standard. Niche perfumery has reversed that trend over the past two decades. Houses such as Maison Francis Kurkdjian, Parfums de Marly, and several artisan studios now present Extrait versions of their signature compositions as the definitive expression rather than as accessory variants.
An Extrait is not always the better choice. It costs more, projects more discreetly, and emphasises richness over freshness. For warm-weather wear or for compositions defined by a luminous top, an Eau de Toilette or Eau de Parfum can be the more enjoyable format. The category should be matched to the intent of the composition rather than chosen on price or prestige alone.
Concentration, cost, and value per wear
Concentration drives a significant share of the retail price. Natural materials such as rose absolute, oud distillates, and orris butter run from several hundred to several thousand euros per kilogram of concentrate, and doubling the concentration roughly doubles the cost of the aromatic material in the bottle. This explains why a 50 ml Extrait can sit at 250 to 500 € (270 to 540 USD) while the corresponding Eau de Toilette sits at half that price.
Cost per wear, rather than cost per bottle, is the more honest metric. A two-spray Extrait application lasting a full day often equals or beats the cost of three to four Eau de Toilette applications across the same period, especially in compositions built around expensive naturals. The arithmetic deserves to be done before dismissing Extrait pricing as disproportionate.
What the regulations actually require
European cosmetics regulation, codified under Regulation (EC) No 1223/2009 and enforced through national authorities, requires accurate ingredient declarations, safety assessments, and labelling of restricted materials at the levels defined by the IFRA Standards (IFRA, accessed 2026-05-29). It does not impose minimum or maximum concentration thresholds for the category labels.
That regulatory silence is why the named categories should be read as conventions backed by industry practice rather than as strict guarantees. For wearers, the practical implication is to anchor expectations to the house and the specific product rather than to the category label alone, especially when comparing across houses or across decades of releases.
Sources
- Perfumer & Flavorist, technical articles on perfume concentration ranges, perfumer's alcohol, and category conventions. Accessed 2026-05-29.
- IFRA (International Fragrance Association), IFRA Standards 51st Amendment, restrictions and labelling rules for fragrance materials, 2024.
- Bois de Jasmin, Victoria Frolova, editorial pieces comparing EDT, EDP and Extrait versions of classic and niche fragrances. Accessed 2026-05-29.
- European Commission, Regulation (EC) No 1223/2009 on cosmetic products, consolidated text, 2024.