The Scent Pyramid Explained: Top, Heart, and Base Notes

The fragrance pyramid is one of the most well-known models in perfumery.

It divides the perceived scent progression into three levels:

Top Note – Heart Note – Base Note.

The model helps to describe a complex fragrance composition in an understandable way.

However, it is important to note:

The fragrance pyramid is a sensory model, not a rigid chemical timeline.

The components of a perfume do not disappear exactly one after another. Instead, many fragrances overlap throughout the entire development.

Technical literature on perfume technology describes the different volatility of components as a key factor in the temporal development of a fragrance.

What is the Top Note?

The top note creates the first impression of a fragrance composition.

Typical directions can be:

• Citrus
• Green notes
• Light fruits
• Aromatic herbs
• Fresh or ozonic accords.

Many materials perceived as fresh notes have a relatively high volatility and are therefore perceived early and distinctly.

The top note is particularly important because it often determines:

Do I like this scent upon first contact?

What is the Heart Note?

The heart note forms the characteristic core of a composition.

Typical scent categories can include:

• Rose
• Jasmine
• Peony
• Lavender
• Spices
• Fruity notes
• Aromatic accords.

The heart note often connects the fresh opening with the longer-lasting base facets.

However, it does not only begin the moment the top note has "disappeared."

Top, heart, and base notes overlap.

What is the Base Note?

Base notes significantly contribute to the depth and substantive effect of many fragrance compositions.

Typical directions:

• Wood
• Amber
• Musk
• Vanilla
• Tonka
• Balsamic or resinous accords.

Technical literature on perfume formulations describes base notes as more substantive and typically longer-lasting than very volatile top notes.

Why is the fragrance pyramid not an exact clock?

A simplified representation often states:

Top note → a few minutes

Heart note → a few hours

Base note → many hours

This can be helpful for orientation.

Chemically and sensorially, however, the process is more complex.

The perception of a fragrance depends, among other things, on:

• Volatility
• Concentration
• Odor threshold
• Interaction with other components
• Carrier material
• Temperature
• Skin or surface.

Therefore, a substance can be perceptible early on and still contribute to the overall effect later.

Is lemon always a top note?

Citrus materials are often used as top notes because many of their characteristic components evaporate relatively quickly.

But here too, the formulation is decisive.

A citrus accord can be stabilized by other components and made perceptible for a longer period.

Is vanilla always a base note?

Vanilla notes are often associated with the base.

However, in a real fragrance composition, they can contribute to the overall perception early on.

Therefore, it means:

"Base note" does not mean "only smellable later."

How does the carrier material change the fragrance pyramid?

A fragrance composition can be perceived differently in various applications.

In alcoholic perfume

Volatile components can be released relatively quickly after application.

In a candle

The fragrance is embedded in a wax matrix.

Different release conditions therefore arise when cold and when burning.

In a Reed Diffuser

Perception is influenced by:

• Carrier base
• Reeds
• Evaporation rate

Therefore, the same fragrance pyramid is a description of the composition, but not necessarily an exact prediction of the scent progression in every end product.

Fragrance Pyramid Example

A composition could, for example, be described as:

Top Note

Bergamot – green apple

Heart Note

Jasmine – Rose

Base Note

Sandalwood – Musk – Vanilla

This does not mean that after a few minutes all top notes disappear and then only jasmine is present.

Rather, it describes the sensory structure and focus of the composition.

Why is the fragrance pyramid useful for product developers?

It helps to:

• Describe fragrances comparably
• Develop product ideas
• Classify fragrance families
• Give customers an idea of the scent character
• Select multiple fragrance compositions specifically.

However, it should always be supplemented by an actual sensory test.

FAQ

Are top notes always the most volatile components?

They often contain particularly volatile components, but the classification is a sensory-perfumery division and not exclusively a physical classification.

Can you smell base notes immediately?

Yes. Base notes can already be an immediate part of the overall scent.

Does every fragrance composition have a fragrance pyramid?

Many perfume compositions can be described this way. However, in very linear scents, the temporal development is less pronounced.

Is the same fragrance pyramid valid in perfume and candle?

The formal scent description can be the same, but the actual perception and release differ due to the carrier system.

Conclusion

The fragrance pyramid is an excellent tool for describing scent in an understandable way.

But:

Top note, heart note, and base note are not three completely separate phases.

A fragrance composition develops continuously and is influenced by volatility, concentration, interactions, and the respective carrier material.

Expertly reviewed by: Aroma Nova Product Development
Status: August 2026

Sources

Rodrigues et al. – Perfume and Flavor Engineering: A Chemical Engineering Perspective.
Zarzo – Research on perceived freshness and volatility in perfumery.