Perfumes are an integral part of our daily lives, and many people seek to better understand the various aspects of these delicate and captivating products. A key concept to understand and explore is the olfactory pyramid, which describes the different notes and structures found in a perfume. In this article, we’ll guide you through this essential concept to help you better decipher the fascinating world of fragrances.

What is the olfactory pyramid?

The olfactory pyramid represents the structure of a fragrance based on three main levels of notes:

top notes: these are the first impressions of the fragrance, the ones you smell immediately after spraying the perfume. They are generally light, fresh, and fleeting,

heart notes: these form the heart of the perfume, often richer and more complex than the top notes. They unfold gradually and last for several hours,

base notes: these are the trail, the signature of the fragrance that will linger longest on the skin. These notes, often deep, are composed of molecules that are heavier and more persistent than those of the other two levels.

By taking a closer look at this pyramid, we can reconstruct a fragrance’s true “identity” and better understand its various facets.

Top notes: the fragrance’s introduction

Often described as the olfactory invitation, top notes are essential for capturing attention from the very first seconds. This is where we discover the initial elements that make up a perfume’s scent. This part is generally composed of volatile, fresh, and light ingredients, such as:

citrus fruits: lemon, orange, grapefruit, bergamot,

certain fruits: apple, pear, raspberry,

some aromatic plants and spices: mint, basil, anise, pink pepper.

Why are they so important?

In reality, top notes do more than just draw us to a specific fragrance; they also play a role in the fragrance’s longevity by contributing to its gradual evaporation. As they dissipate quickly, they allow the other notes—more complex and persistent—to gradually unfold on our skin.

Middle notes: at the heart of the fragrance’s personality

Also known as "heart notes," the heart notes are the true core, the very essence of a fragrance. This is where the main olfactory characteristics and the true identity of the fragrance lie. These are often more complex and powerful ingredients, such as:

flowers: rose, jasmine, tuberose, ylang-ylang,

spices: cinnamon, clove, ginger,

and certain woods: sandalwood, cedar, vetiver.

How long do they last?

Generally, heart notes can be detected for several hours after applying the perfume. Their longevity and intensity vary depending on the specific ingredients present, as well as factors such as the outside temperature and each person’s skin type.

Base notes: the final signature

At the heart of the scent trail, these notes are the ones that linger the longest and allow the fragrance to maintain its longevity over time. Their purpose is to reinforce the other layers and create synergy among all the elements of the olfactory pyramid. Rich and deep, base notes are notably composed of:

resins: incense, myrrh,

precious woods: oud, ambergris,

and various musks: animalic, white.

How are they perceived?

Base notes take longer to reveal themselves than the other layers, sometimes several hours after applying the perfume. They can also evolve over time and vary from person to person depending on the specific characteristics of the skin.

Decoding a fragrance using its olfactory pyramid

Now that you have a better understanding of what the olfactory pyramid is and its various elements, it’s time to put this knowledge into practice by deciphering the different notes and structures present in your favorite perfumes or those you’re considering buying! By understanding the balance between the different top, middle, and base notes, you’ll be able to better appreciate each fragrance as a whole and make informed choices for your future purchases.