How is perfume made? From raw material to bottle

What is perfume made of?

Perfume is made by combining fragrant materials in a formula, diluting that concentrate, usually in ethyl alcohol, letting it rest, then chilling, filtering and bottling it. The natural materials in the formula come from plants by three main routes: steam distillation, cold expression of citrus peel, and solvent extraction. Alongside them sit individual aroma molecules made in the laboratory. The same plant can become a differently smelling material depending on how it is processed, so the production method is a decision that shapes what ends up in the bottle.

A perfumer's palette holds four kinds of material. Essential oils are obtained by distillation or expression. Extracts such as concretes, absolutes and resinoids are obtained with solvents. Isolates are single compounds separated from a natural oil. Synthetic molecules are made by chemical reactions and sometimes smell like nothing found in nature. The carrier is usually ethyl alcohol prepared for perfumery. The word “rose” or “musk” in a note list does not tell you which of these materials was used; that is where the difference between a note and a raw material begins.

Steam distillation: how is an essential oil obtained?

In steam distillation, plant material is brought into contact with steam. The steam carries volatile aroma compounds with it at temperatures below their own boiling points. The vapour condenses as it passes through a cooler and separates into two layers in the collecting vessel. Most essential oils are lighter than water and gather on top; the water left below is called aromatic water. Rose water is the best-known by-product of this process. When the plant is boiled directly in water, the method is called hydrodistillation, which international terminology treats as a form of steam distillation.

ISO 9235, the International Organization for Standardization's vocabulary for aromatic natural raw materials, reserves the name “essential oil” for three routes only: steam distillation, mechanical expression of citrus peel, and dry distillation. Dry distillation heats the material directly without water; smoky, dark materials such as birch tar are made this way. The distinction is more than wordplay. A jasmine extract obtained with a solvent is technically not an essential oil but an absolute. Marketing copy that calls both of them “oil” hides the difference.

Because distillation uses heat, it does not suit every material. Roots, leaves, woods and seeds mostly rely on it; vetiver oil is distilled from dried roots. In some flowers that are sensitive to heat and water, however, steam alters part of the scent or leaves it behind in the water. As you will see below, rose is one of the best examples of a loss that can actually be measured.

Why is citrus peel pressed rather than distilled?

The fragrant oil of lemon, orange, mandarin and bergamot sits in tiny oil glands in the outer layer of the peel. It is released without heat by rasping or mechanically crushing the peel, a method known as cold expression. Avoiding heat helps preserve the bright, peel-like freshness that citrus gives in the first moments. ISO 9235 defines these products as essential oils too.

Expressed oils can also contain substances from the peel that steam would not carry. Bergapten, present in expressed bergamot oil at around 0.2 per cent, is the well-known example. It is a furocoumarin that can cause a phototoxic skin reaction when combined with sunlight. For this reason the International Fragrance Association, IFRA, limits how much expressed bergamot oil a finished product may contain, and furocoumarin-free bergamot oils are produced for perfumery. You can read how this difference shows up in the scent on the bergamot note page.

Solvent extraction: concrete, absolute and resinoid

The scent of delicate flowers such as jasmine is mostly captured with solvents. The flowers are washed with a volatile solvent such as hexane, which dissolves the aroma compounds together with the plant's natural waxes and pigments. When the solvent is removed under reduced pressure, a waxy, solid or semi-solid mass remains: the concrete. The concrete is mixed with ethyl alcohol, chilled and filtered so that the waxes, which do not dissolve in alcohol, are left behind. Once the alcohol is removed as well, the dense, dark extract that remains is called an absolute.

Steam-distilled jasmine oil is also produced, but in perfumery the usual route is concrete and absolute. An absolute can better preserve compounds that might pass into the water or change with heat during distillation. That is why an absolute and a distilled oil from the same flower can share a name and still give different scent profiles. The jasmine note page explains how that full floral scent reads in a perfume.

An extract obtained with solvents from dry plant material or resin is called a resinoid. Benzoin, the resin of Styrax species, is one of the examples ISO 9235 gives. A fourth route is supercritical carbon dioxide: above roughly 31 °C and 74 bar, carbon dioxide behaves partly like a gas and partly like a liquid and extracts at a comparatively low temperature. When the pressure is released, the carbon dioxide leaves as a gas; no organic solvent such as hexane is used. Enfleurage, which absorbs flower scent into solid fat, was largely replaced by solvent methods towards the middle of the 20th century and survives today mainly in historical and artisanal practice.

Why can the same rose give two different smells?

Rosa damascena, the oil-bearing Damask rose, is both distilled and extracted with solvents, and the two routes do not smell the same. A study published in 2016 by Sabri Erbaş and Hasan Baydar of the Faculty of Agriculture at Süleyman Demirel University in Isparta, Türkiye, measured that difference. The researchers used gas chromatography to compare the air around fresh flowers, hydrodistilled rose oil, rose water, concretes prepared with different solvents, and the absolutes made from them. In the scent of the fresh flower, phenylethyl alcohol had the largest share, at about 43 per cent. In the distilled rose oil the same compound reached only 1.3 per cent; the oil was dominated by geraniol, citronellol and nerol.

On the solvent route the picture reversed. Phenylethyl alcohol made up about 17 to 23 per cent of the concretes and about 35 to 38 per cent of the absolutes. The missing compound had not disappeared: because it dissolves relatively well in water, it had gone into the water rather than the oil during distillation. In the same study, more than 98 per cent of the volatile fraction of the water left in the still was phenylethyl alcohol, and it was also the main compound in rose water.

The difference can be smelled. Shaped by geraniol and citronellol, rose oil can draw a brighter rose with a faintly lemony, geranium-like edge. An absolute rich in phenylethyl alcohol can feel softer, honeyed and closer to the fresh flower. The measurements were made on samples prepared in a laboratory, and the composition of commercial oils varies with region, harvest time and processing. Still, the principle is clear: the production method is part of a material's smell. The cues on the rose note page help you tell which side of the rose you are smelling in a perfume.

What did synthetic molecules add to perfume?

Until the middle of the 19th century, perfumers worked only with natural materials. In 1868 the English chemist William Henry Perkin produced coumarin in the laboratory. In 1874 the German chemists Ferdinand Tiemann and Wilhelm Haarmann made vanillin from coniferin, a compound found in the sap of conifers. Houbigant's Fougère Royale of 1882 is often cited as one of the first perfumes to feature synthetic coumarin. Since then, synthesis has given perfumers scents that do not exist in nature, alternatives to materials whose natural source is costly or inconsistent, and molecules that replace animal materials no longer in use.

Musk is the clearest example. Natural musk, taken from a gland of the musk deer, has largely given way in perfumery to synthetic musk molecules since the species came under protection. The musk you smell in a perfume today is usually a laboratory-made molecule or an accord built from such molecules. The musk note page explains these molecular families and why not everyone smells musk with the same strength. In the same way, instead of ambergris, which forms in the gut of the sperm whale, perfumers use synthetic or semi-synthetic molecules resembling the odorants that appear as ambergris oxidises over time; the details are on the ambroxan page.

Synthesis is not used only for imitation. In the mid-1970s, a research programme led by Roman Kaiser at Givaudan set out to capture and analyse the air around living flowers and rebuild their scent with molecules. Thanks to this headspace method, even flowers that cannot be distilled or extracted could enter a formula as an accord.

The difference between “natural” and “synthetic” is not a safety ranking either. The European Union's Scientific Committee on Consumer Safety, the SCCS, counted 28 natural extracts among the substances recognised as contact allergens in humans. With Regulation (EU) 2023/1545, the EU added 56 substances to the fragrance allergens that must be named separately on the label; products that do not follow this rule may not be newly placed on the market since 31 July 2026. IFRA standards also apply the same logic to natural and synthetic materials.

Formula, alcohol and rest: the last steps to the bottle

Once the materials are ready, the perfumer writes a formula. The proportion of each material is set one by one; sometimes several materials are combined into accords that give a single impression, such as leather, amber or rain. Trial samples are smelled again and again over time and the proportions are adjusted. When the approved formula is weighed out and blended, the result is the perfume concentrate, the alcohol-free core of the scent.

The concentrate is then diluted with ethyl alcohol and, where needed, a little water. That ratio relates to whether a product is called eau de toilette or eau de parfum, but these names are not universal legal percentages and do not determine longevity on their own. You will find the details in EDT, EDP and parfum concentration explained.

Most producers let the diluted perfume rest for a while. During this time, slow chemical changes can take place between the materials and the scent settles. The mixture is then chilled and filtered: waxes and similar substances that lose their solubility at low temperature are separated out so that the perfume does not turn cloudy later. There is no common industry standard for the length of this rest; it varies with the producer and the formula. Finally, the perfume is bottled. What protects the scent once it is in the bottle is covered in how to store perfume.

How does making perfume at home compare with this process?

What can be done at home is diluting and blending ready-made materials. Distillation, extraction, purification, resting and quality control all fall outside that. A home blend is therefore not a copy of a commercial perfume that lists the same notes; it is a different product. Working only with natural oils also means staying outside the range of scents that synthetic molecules opened up.

The safety limits are real as well. According to a 2016 review by Anton de Groot and Erich Schmidt, nearly 80 essential oils have caused contact allergy, and most reactions were linked to applying pure oils or high-concentration products to the skin. Ethyl alcohol is a highly flammable liquid whose vapour can ignite at around 13 °C. So essential oils should not be applied to skin undiluted, alcohol-based blends should be kept away from open flames and heat sources, and a new blend should first be tried on a small area. This article gives no recipe; its aim is to show which decisions add up to the scent in the bottle.

How does this help when you judge a perfume?

Knowing the production chain helps you read a note list correctly. The word “rose” can point to a rose oil, an absolute, a single isolate or an accord built entirely from molecules, and all four smell different. When you try a perfume, asking “which rose?”, that is, noticing whether it feels bright and lemony or honeyed and dense, tells you far more than the label. You can ask the same question of every note: does it smell as if it came from a root, a flower, a resin or a laboratory? That observation is the most reliable way to find the direction you liked in your next perfume.