Oud is one of the most valuable materials in perfumery and one of the least understood. It is not a flower, not a spice and not a single smell. It is a resin that a tree produces when it is wounded, and the story of how that resin becomes an oil explains almost everything about its scent and its price.
What is oud?
Oud is the dark, fragrant resin that forms inside agarwood trees (mainly the Aquilaria genus) after the tree is infected or injured. The resin-soaked heartwood is burned as incense, and distilled to produce oud oil, one of the most expensive raw materials in perfumery.
The word comes from Arabic, where oud simply means wood. In India it is known as agar or agarwood, and in the trade you will also see aloeswood and gaharu. The same material appears in three forms: wood chips for burning, oil for perfumery and attars, and blended compositions in bakhoor and modern perfumes.
How oud forms in the tree
Healthy agarwood is pale and almost odourless. The fragrance only appears when the tree defends itself. When the wood is wounded and infected, typically by a mould, the tree produces a dense, aromatic resin to seal the damage. Over years, that resin darkens and saturates the heartwood.
In the wild only a small share of trees ever become infected, which is why wild oud has always been rare. Most oud today comes from cultivated plantations across South and Southeast Asia, where trees are deliberately inoculated to trigger resin formation. India’s north-east, particularly Assam, has a long history with agarwood.
Worth knowing: agarwood species are protected under CITES, the international treaty on trade in endangered species. Legitimate oud, especially for export, should come with traceable sourcing and the right paperwork.
How oud oil is made
Oud oil is produced by distillation, usually hydro distillation, where resinated wood is ground, soaked and then boiled in water. The steam carries the aromatic compounds into a condenser, and the oil separates from the water.
- Soaking: the ground wood is soaked, often for days or weeks. Soaking time shapes the final character, and longer soaking can add a fermented, animalic depth.
- Distillation: runs are long, often several days, because the heavy resin molecules release slowly.
- Yield: very low. A large quantity of wood produces a very small quantity of oil.
The origin of the wood, the grade of resination, the soaking and the distillation method all change the result. That is why two oud oils can smell completely different.
What oud smells like
Oud is woody first, but rarely just woody. Depending on origin and distillation, it can show:
- Smoky, leathery and resinous facets
- A sweet, honeyed or balsamic warmth
- An animalic, barnyard edge, especially in Indian and Assamese styles
- Earthy, mushroomy or medicinal notes
Many people’s first reaction to pure oud is surprise. On its own it can be challenging. In perfumery it is usually blended with rose, saffron, amber, sandalwood or musk, which is how most people know it.
Why oud is so expensive
- Resin forms rarely and slowly. Even cultivated trees take years to produce good resin.
- The yield is tiny. Large volumes of wood give very little oil.
- Distillation is slow. Long runs mean more fuel, labour and equipment time.
- Trade is regulated. CITES controls add cost and limit supply.
- Grades vary enormously. Top-grade, heavily resinated wood commands a large premium.
Natural oud vs oud accords
Most oud fragrances on the market do not rely on natural oud alone. Perfumers build oud accords from woody, leathery and smoky materials, sometimes with a small amount of natural oil for authenticity.
| Natural oud oil | Oud accord | |
|---|---|---|
| Source | Distilled from resinated agarwood | Built by a perfumer from several materials |
| Character | Complex, varies batch to batch | Consistent, can be tuned to a brief |
| Cost | Very high | Far more accessible |
| Best for | Luxury attars, collector oils | Perfumes, bakhoor and products at scale |
Neither is a lesser product. An accord is the reason oud can appear in a body spray, a candle or a mass-market perfume with the same scent every batch.
Building an oud perfume, attar or bakhoor for your brand?
How oud is used
- Attars and perfume oils: applied to the skin in small amounts, often blended with rose or sandalwood.
- Bakhoor: oud chips, or oud compositions on a wood carrier, burned to scent rooms and clothes.
- Fine fragrance: as a base note in Eau de Parfum and extrait, where it adds depth and longevity.
- Home fragrance: oud accords in candles, diffusers and room sprays, especially for Middle Eastern markets.
Frequently asked questions
What is oud called in India?
In India oud is called agar or agarwood. Assam in the north-east is the best-known source, and Indian oud oils are known for a rich, animalic character.
What does oud smell like?
Oud smells woody, smoky and resinous, often with leathery, sweet or animalic facets. The exact character depends on the origin of the wood and how it was distilled.
Why is oud so expensive?
The resin forms only after the tree is infected, takes years to develop, yields very little oil, needs long distillations and is regulated under CITES. Together that makes natural oud one of the costliest materials in perfumery.
Why is oud important in Middle Eastern culture?
Oud has been burned and worn across the Arab world for centuries. It is part of hospitality, celebrations and Friday rituals, and is used to scent homes, clothing and guests.
Is oud the same as bakhoor?
No. Oud is the raw material. Bakhoor is a burnable product made from wood chips soaked in fragrance oils, which may or may not contain natural oud. Read our guide to bakhoor.
Does Sawai make oud fragrances for brands?
Yes. Oud compositions sit at the centre of our Middle Eastern work, from attars and mukhallat to bakhoor oils and modern perfumes. See our Middle Eastern fragrances or get in touch.
Developing an oud fragrance?
Sawai has created Middle Eastern fragrances since 1965 — oud perfumes, attars, mukhallat and bakhoor — with our own distillation in Kannauj and compounding in Surat.
