What is the sillage of a fragrance?

Sillage is what stays in the air once you have left the room. The word comes from the sea: the wake a boat leaves behind it on the water. Perfumery borrowed it for the same thing — the olfactory trace a fragrance leaves in space, at a distance from the skin wearing it.

It is a social measurement. It cannot be taken on yourself.

What exactly is sillage?

Two things almost always get confused. There is what you smell when you bring your wrist to your face: that is a contact measurement. And there is what someone sitting opposite you, a metre away, perceives without making any effort: that is sillage.

The two do not move together. A fragrance can be dense at the wrist and stay exactly there. Another can seem held back up close and fill a whole room. The difference lies in the volatility of the materials used and in the way they spread once they have turned to vapour.

Why can you not judge your own sillage?

Because your nose stops perceiving it. The phenomenon is called olfactory adaptation. Exposed without interruption to the same smell, the olfactory system reduces its response until perception dies out.

A study published in Chemical Senses in 2014 (Stuck, Fadel, Hummel and Sommer) measured this threshold in twenty people with a normal sense of smell. Two results are worth keeping. The time needed for perception to disappear completely increases with the concentration of the product being smelled. And the longer the pause before a new exposure, the more strongly the smell is then perceived.

In other words, there is no fixed length of time after which you stop smelling your own fragrance. It depends on the molecule and on the dose. What is certain is that the fade-out happens, and that it concerns only you. The fragrance itself has not moved. Other people still smell it.

That is why people re-spray at the end of the morning. Not because the fragrance has gone out, but because they no longer hear it. The gesture is almost always one too many.

So how do you measure your sillage?

Three methods, in decreasing order of reliability.

Ask. It is the only direct measurement. Someone walking into the room after you will be able to say in three seconds what you can no longer know.

Count the remarks. If people mention your fragrance without your having brought it up, there is sillage. If nobody says anything, that is not a fault in the fragrance: it is information about it.

Go out, then come back. Leave the room for ten minutes, breathe outside, come back in. Perception partly returns. It is imperfect, and it is exactly what the study cited above measured: rest restores sensitivity.

Is strong sillage good sillage?

No. It is a characteristic, not a quality. Powerful sillage is an asset at a dinner and a mistake in a shared office. Restrained sillage is a compositional choice, not a manufacturing failure.

The demonstration fits into two bottles from the catalogue. Both are extraits de parfum, that is, the most concentrated term on the shelf.

• Battito d’Ali, by Profumum Roma — orange blossom, myrrh, vanilla, over a base of cocoa. Documented sillage: discreet. It is one of the four fragrances in the catalogue rated at that level.
• Outlands Essence, by Amouage, composed by Cécile Zarokian — cardamom, frankincense, oud, ambergris. Documented sillage: very strong.

Same term on the bottle, opposite behaviour in a room. Concentration says nothing about sillage.

How do you read sillage on a PlanèteBeauty page?

Each of the 201 fragrances in the catalogue carries a documented sillage, from the most discreet to the most demonstrative. The spread is worth a look: only four fragrances are rated discreet, nineteen are rated very strong, and everything else sits between the two — survey of 30 August 2026. Niche perfumery is not systematically loud: that is a received idea our own figures contradict.

The oldest fragrance in the catalogue is, as it happens, one of those four discreet ones. Mûre Musc, by L’Artisan Parfumeur, composed by Jean-François Laporte in 1978, rests on blackberry, musk and basil. A fragrance that does not impose itself has lasted forty-eight years. Restrained sillage has never stopped anyone from enduring.

That said, this rating describes an average behaviour, on average skin, in an average room. It gives a direction. It does not replace trying. That is what a Try Me sample is for: wear the fragrance for a whole day, and let other people take the measurement you cannot take.

— BH