The essentials
An essential oil, also called an essence, is obtained by steam distillation of plant material or by mechanical cold-pressing of citrus peels. Both methods rely on heat or pressure rather than solvents, and both yield a volatile aromatic oil suitable for direct use in formulation. An absolute is obtained by a two-step process: a non-polar solvent (typically hexane) is used to extract a waxy semi-solid called a concrete; the concrete is then washed with ethanol at low temperature, the waxes precipitate out, and the absolute remains after the alcohol is removed under reduced pressure (Perfumer & Flavorist, accessed 2026-05-29).
The two methods produce different aromatic profiles. Steam distillation works at temperatures around 60 to 100 °C (140 to 212 °F), which destroys or transforms heat-sensitive compounds. Solvent extraction operates at near-ambient temperature and preserves a wider range of thermolabile molecules. For most flowers, the absolute reads closer to the living bloom than the corresponding essential oil; for many woods, herbs, and citrus peels, the essential oil remains the better material.
Cost reflects yield and process complexity. Citrus essential oils run a few tens of euros per kilogram; rose absolute from Grasse or Bulgaria can exceed 10,000 € (10,800 USD) per kilogram, with jasmine absolute in the same range. The economic gap explains why absolutes appear in higher-end niche compositions and why claims about natural content deserve scrutiny in mass-market settings (Bois de Jasmin, accessed 2026-05-29).
Solvent extraction and the concrete
Solvent extraction begins by immersing plant material, most often delicate flowers, in a non-polar solvent such as hexane. The solvent dissolves both the aromatic compounds and the plant waxes, creating a semi-solid called the concrete. The concrete carries the full aromatic profile of the source material but is too waxy and viscous to use directly in a fragrance formula.
In the second step, the concrete is dissolved in ethanol at low temperature. The alcohol dissolves the aromatic compounds but not the waxes, which precipitate out and are filtered away. The alcohol is then removed under reduced pressure and temperature, leaving a concentrated, intensely aromatic liquid or semi-liquid: the absolute. The process preserves heat-sensitive molecules that would otherwise be destroyed by distillation, which is why absolutes of jasmine, tuberose, mimosa, and violet read so close to the living flower.
Steam distillation and cold-pressing
Steam distillation passes water vapor through plant material in a still. The steam carries volatile aromatic compounds, which condense alongside it in the collection vessel and separate from the water by density. The essential oil layer is collected and bottled. The process is fast, relatively inexpensive, and solvent-free, but the heat involved destroys some heat-sensitive molecules and can transform others. The technique works particularly well for woody materials, herbs, spices, and many essential oils.
Cold-pressing, used almost exclusively for citrus peels of bergamot, lemon, sweet orange, bitter orange, mandarin, and grapefruit, applies mechanical pressure to rupture the oil glands in the peel without heat. The result is bright and fresh, closely matching the smell of the peel. Several cold-pressed citrus oils contain photosensitising compounds such as bergapten, which is why IFRA Standards regulate their use in leave-on cosmetics (IFRA, accessed 2026-05-29).
Why some flowers need solvent extraction
Several key perfumery flowers cannot be captured accurately by steam distillation because their aromatic compounds are thermolabile: they break down or transform at the temperatures required for distillation. Jasmine, tuberose, violet, mimosa, and narcissus fall into this category. For these materials, solvent extraction is the only practical route to a faithful natural extract; the resulting absolute is treated as the reference material in perfumery.
This is also why products marketed as jasmine essential oil outside the perfumery trade are almost always reconstituted blends or synthetic alternatives rather than true distilled jasmine, which would have poor organoleptic quality. Genuine jasmine absolute from Grasse, India, or Egypt remains one of the most expensive and most carefully sourced natural materials in fine fragrance (Now Smell This, accessed 2026-05-29).
CO2 extraction as a third route
Supercritical CO2 extraction uses carbon dioxide held under high pressure and controlled temperature, where it behaves as both a gas and a liquid. In this state, CO2 dissolves aromatic materials with high selectivity and leaves no residue, since the carbon dioxide returns to gas at normal pressure. The technique is more capital-intensive than distillation but more efficient than solvent extraction for several delicate materials.
CO2 extracts often sit between an absolute and an essential oil in olfactive character: more complete than a distillate, often greener and brighter than a solvent absolute. The route is increasingly used in niche and natural perfumery for materials such as vanilla, frankincense, hops, and certain spices, where it captures aromatic facets that neither distillation nor solvent extraction reaches cleanly.
How absolutes are used in niche perfumery
Natural absolutes are foundational materials in higher-quality niche perfumery. Rose absolute from Grasse or Bulgaria, jasmine absolute from Grasse, India, or Egypt, labdanum absolute from Spain, and orris butter from Florence are among the building blocks of many classic and contemporary natural compositions. The cost, complexity, and limited supply of these materials separate compositions that use them from formulas built primarily on synthetic alternatives.
Modern niche perfumers generally combine natural absolutes with synthetic materials. The synthetic compounds provide consistency, regulated longevity boosters, and compliance with IFRA Standards; the absolutes provide the depth, complexity, and naturalness that synthetics cannot fully replicate. The interplay between the two registers is one of the defining technical conversations of contemporary niche perfumery (Perfumer & Flavorist, accessed 2026-05-29).
Regulatory and labelling considerations
Both absolutes and essential oils are subject to IFRA Standards governing the use of fragrance materials, and to EU cosmetics regulation requiring full ingredient declaration of restricted materials. Several allergens commonly present in natural extracts, including linalool, limonene, geraniol, and citronellol, must be labelled above defined thresholds, and several materials are restricted at specific maximum-use levels in leave-on products.
For the wearer, the practical implication is that natural does not equal safe at any concentration. Genuine absolutes and essential oils contain potent allergens, and a credible niche house complies with the same IFRA framework that mass-market producers use, regardless of how natural the composition presents on the label. The IFRA approach to safety applies across naturals and synthetics in the same way (IFRA, accessed 2026-05-29).
Sources
- Perfumer & Flavorist, technical articles on extraction methods (solvent, distillation, CO2) and natural raw materials in fine fragrance. Accessed 2026-05-29.
- IFRA (International Fragrance Association), IFRA Standards 51st Amendment, restrictions on natural and synthetic fragrance materials, 2024.
- Bois de Jasmin, Victoria Frolova, editorial pieces on rose, jasmine, and orris absolutes and their use in perfumery. Accessed 2026-05-29.
- Now Smell This, editorial coverage of natural materials and origin sourcing. Accessed 2026-05-29.