Most oud perfume sold in the UK contains no oud.

That sounds like an accusation. It is not. It is simply how the category works, and once you understand why, you stop overpaying for the wrong things and start buying oud fragrances that actually suit you.

Oud has gone from a material almost nobody in Britain had smelled to a word on the front of bottles in every high street chemist. The understanding has not kept pace with the marketing. So here is what oud is, what is really in the bottle, and how to buy it without being taken for a ride.

What oud actually is

Oud, also called agarwood, is not a wood in the ordinary sense. It is a resin.

Trees of the Aquilaria genus, which grow across South and Southeast Asia, occasionally become infected with a particular mould. In response, the tree floods the infected heartwood with a dark, dense, aromatic resin to defend itself. That resinous wood is agarwood. Distil it and you get oud oil.

The critical detail is the word occasionally. In the wild, only a small minority of Aquilaria trees ever become infected, and there is no way to tell from the outside which ones have. Historically, finding agarwood meant felling trees and hoping. Several Aquilaria species are now listed as threatened, and international trade in them is restricted.

So the raw material is scarce, slow to form, and legally constrained. Pure oud oil is routinely described as one of the most expensive raw materials in perfumery, and the comparisons to the price of gold by weight are not marketing hyperbole.

Which is why your bottle probably does not contain any

Run the arithmetic. If pure oud oil costs what it costs, a perfume retailing for less than the price of a takeaway cannot contain a meaningful quantity of it. Nothing about that is dishonest, provided nobody claims otherwise.

What you are buying instead is an oud accord: a constructed impression of oud, built from synthetic aroma molecules alongside materials like cypriol, patchouli, birch tar, labdanum and guaiac wood. A well built oud accord is a genuine piece of craft. Some of them smell more like most people’s idea of oud than real oud oil does, because real oud is strange. Depending on origin it can read barnyard, medicinal, sour or almost cheesy before it settles. Perfumers building for a mass audience smooth all that out.

Cultivated agarwood, from plantations where trees are deliberately inoculated, has also brought real oud within reach of mid-priced perfumery. It is not the same as wild Cambodian or Hindi oud, and it does not pretend to be.

The practical upshot: judge an oud perfume by how it smells, not by whether the word appears in the notes list. Among the Arabian oud and woody fragrances stocked in the UK you will find bottles at every point on that spectrum, and price is a poor guide to which you will actually enjoy wearing.

Two schools: Arabian and Western

They are different things wearing the same word.

Arabian oud puts the material at the centre. Oud leads, and rose, saffron, amber and incense are built around it. These are dense, long lasting, unapologetic fragrances, often in high concentrations, designed for a culture where perfume is applied generously and expected to last from morning prayers to late evening. Houses such as Lattafa, Ard Al Zaafaran, Ahmed Al Maghribi and Rasasi work in this tradition.

Western oud uses it as an accent. A designer fragrance labelled oud typically has a woody, slightly smoky thread running through a composition that is really about something else: fruit, leather, vanilla, a clean musk. It is oud made polite for an audience that has never smelled the raw material.

Neither is better. But a lot of British buyers try a Western oud, decide oud is not for them, and never go near the real thing. The reverse happens too: someone starts with a dense Arabian oud, finds it overwhelming, and concludes the whole category is too much.

If you have only tried one school, you have not really tried oud.

How to read a UK oud listing

Four things actually tell you something.

Where oud sits in the pyramid. A fragrance with oud in the base is using it as a foundation, and you will meet it an hour in. Oud in the heart means it is a main character. Many so called oud perfumes bury it so deep it barely registers.

Oud in the name versus oud in the notes. The name is marketing and is not regulated. The notes list, while still a marketing document, at least has to be broadly defensible. Read the notes.

The concentration. Eau de parfum and extrait de parfum carry more aromatic material than eau de toilette, which matters disproportionately for woody and resinous compositions. A thin oud is a sad thing.

What it sits next to. Oud plus rose is the classic Arabian pairing and reads rich and slightly sweet. Oud plus saffron is leathery and dry. Oud plus vanilla or amber goes warm and cosy. Oud plus incense goes austere and almost sacred. The partner tells you more about the final impression than the oud does.

What oud does on skin

Three things surprise people.

It lasts. Resinous materials are heavy molecules that evaporate slowly. Eight to twelve hours is normal for a well made Arabian oud, and the trace on a scarf or coat can survive a wash.

It projects. Particularly in the first two hours. This is the single most common mistake British buyers make with Arabian fragrance: applying the four or five sprays they would use with a light designer scent. Two is usually plenty. One can be enough.

It changes on you. Oud accords interact with skin chemistry more dramatically than most materials. A fragrance that smells sharp and medicinal on a friend can turn warm and smooth on you. Never buy a serious oud on someone else’s description alone.

Buying oud perfume in the UK

The market has changed enormously in five years. Arabian houses that once meant a trip to Edgware Road or a parcel from Dubai are now stocked and shipped domestically, which solves the two real problems with buying oud: long waits and uncertain authenticity.

What to check before you buy:

• Sealed boxes. Cellophane should be tight and cleanly folded. Loose, cloudy or missing wrapping on a supposedly new bottle is a reason to pause.
• A batch code on both bottle and box, and matching.
• UK stock and UK dispatch, so you are not exposed to customs charges or six week waits.
• A real returns address. Fragrance is one of the easier categories to counterfeit, and the usual marketplace protections are thin.
• Sample sizes, where offered. Oud is the category where blind buying goes wrong most often, and a sample costs a fraction of a full bottle.

Retailers specialising in the category tend to do better on all five than general marketplaces, simply because the stock comes through fewer hands. It is worth seeing what a specialist actually carries in oud and woody before defaulting to whichever bottle a supermarket happens to stock.

Where to start, depending on what you want

If you have never worn oud: start with something where oud supports rather than leads. Look for oud alongside vanilla, amber or fruit. You get the depth without the medicinal edge that puts beginners off.

If you want the real Arabian experience: go for oud with saffron or rose, in eau de parfum or extrait. Expect to be noticed. Apply less than you think.

If you want office appropriate: oud with citrus or a clean woody base. Still distinctive, and it will not take over a meeting room.

If you already know you love it: this is where the Arabian houses pull away from the designers, both in concentration and in how far they are willing to push the material. The oud and woody range on Perfumeo runs to over a hundred bottles in stock across Lattafa, Ard Al Zaafaran, Brandy Designs, French Avenue, Ahmed Al Maghribi and others, which is a different kind of shopping to picking from the three ouds on a department store shelf.

The one thing worth remembering

Oud is not a smell. It is a family of smells, spanning the barnyard funk of wild Hindi oil to the clean woody warmth of a modern accord, and the word on the bottle tells you almost nothing about which end you are getting.

Smell before you commit where you can. Buy from someone who can tell you what is actually in it. And spray less than you think you need.