Fragrance Education
Several distinct methods exist for pulling scented oils out of raw materials, and every fragrance house uses them a little differently — a source of the specialized styles that make certain manufacturers recognizable.
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The extraction method matters as much as the raw material itself. The same flower, processed two different ways, can yield noticeably different scent profiles.
Steam Distillation
The most common extraction method, steam distillation passes hot steam through raw plant material, carrying volatile aromatic compounds along with it. The resulting vapor is cooled and condensed, separating essential oil from water. It’s an efficient, widely used process for materials like lavender, rosemary, and many woods.
Solvent Extraction
For delicate flowers that can’t withstand the heat of steam distillation — jasmine, tuberose, gardenia among them — solvent extraction uses chemical solvents to pull out aromatic compounds, producing a waxy substance called a concrete. Further processing with alcohol refines the concrete into an absolute, a highly concentrated, true-to-nature scent.
Expression
Used almost exclusively for citrus peels, expression is a mechanical, cold-pressing method that squeezes the essential oil directly from the rind without heat or solvents — preserving the bright, fresh character citrus oils are known for.
Enfleurage: A Historical Method
Enfleurage is an older, labor-intensive technique where flower petals are laid onto fat, which slowly absorbs their scent over repeated cycles of fresh petals. Largely replaced by more efficient modern methods today, it’s still occasionally used for the most delicate, heat-sensitive flowers where other techniques struggle to capture the true scent.
CO2 Extraction
A newer technique, CO2 extraction uses pressurized carbon dioxide as a solvent, then releases the pressure to leave behind a pure extract. It’s prized for capturing a raw material’s scent with minimal alteration, often producing an oil closer to the living plant’s true smell than other methods.
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Frequently Asked Questions
Why do perfumers use different extraction methods?
Different raw materials respond differently to heat, solvents, and pressure — delicate flowers like jasmine need gentler methods than sturdy woods or citrus peels.
What is an absolute in perfumery?
A highly concentrated aromatic extract produced through solvent extraction, typically used for delicate flowers that can’t withstand steam distillation.