The Layers of Oud Scent: The Top Note, the Heart, and the Base

We saw that the scent of oud shifts during burning. Now we give this shift an organized framework that helps you read it: the layers of the scent — the top note, the heart, and the base. This framework, borrowed from the world of perfume, gives you a language to describe the journey of oud and compare pieces. In this article — the first of the families group — we explain each layer and how to read it.

The three layers

The journey of the scent is usually divided into three successive layers, each with its role:

• The top note: the first thing you smell, from the light, fast-evaporating compounds. It may be sharp, sweet, or fresh, and lasts a few minutes.
• The heart: the essence of the piece's personality when it settles, and the most important layer because it represents the true character you will live with.
• The base: the heavy depth that remains at the end and lasts longest, from the heavy compounds like sesquiterpenes and chromones.

These layers do not separate sharply, but overlap and gradate. As the top note fades the heart rises, and as the heart calms the base settles. A good piece gives you a complete journey across the three layers, not a single note that dies out.

Layers and families together

The layers describe when you smell the scent, while the families (woody, earthy, animalic, sweet, saffron, smoky) describe what you smell. The two intersect: the top note may be sweet and saffron-like, the heart woody and earthy, and the base animalic and deep. This intersection is what makes the unique "signature" of each piece.

And so in the following articles we detail each family on its own, so you learn to distinguish it and then locate it in the layers. When you say "a woody heart with a sweet base," you have combined the layer and the family into a precise description.

How do you read the layers practically?

Heat a piece with a gentle, graduated heat, and record what you smell at each stage: what is the first note? What did the heart settle into? And what remained in the base? Do not rush the judgment; give each layer its minutes. And with repetition you will develop an "olfactory memory" by which you distinguish the layers automatically.

And this framework will accompany us through the rest of the guide: for each family we explain, you will find a place for it in these layers. We begin in the following article with the most famous of the families and the most associated with oud: the woody note.