The Aurisse Journal
Sillage vs Projection: The Two Words That Explain Everything
Projection is how far your fragrance travels from your skin. Sillage is the trail it leaves behind you as you move. They are related but not the same, and the difference explains most complaints people have about fragrance, including the common one where a scent lasts all day but nobody notices it.
Projection, defined properly
Projection is the radius around you where the fragrance is detectable while you are standing still. Sometimes called the scent bubble.
Strong projection means someone across a table notices without leaning in. Weak projection, often called a skin scent, means someone has to be close to smell anything at all.
Projection is at its highest in the first hour and drops steadily. A fragrance that fills a room at nine will usually be an arm's length affair by noon, even if it is still clearly present on your skin at midnight.
Sillage, defined properly
Sillage is a French word meaning wake, as in the trail a boat leaves in water. In fragrance it describes the scent left hanging in the air after you have walked past.
Sillage is about movement. Someone sitting beside you experiences projection. Someone who walks into a lift thirty seconds after you left it is experiencing sillage.
The two often go together but not always. Some fragrances sit close to the skin while still leaving a noticeable trail, because the materials that travel are not always the ones you smell most strongly up close.
Why the difference matters when you buy
Most people describing what they want are actually describing one or the other without knowing it.
"I want people to notice it" usually means projection. "I want people to notice after I have gone" means sillage. "I want it just for me" means low projection with decent longevity, which is a specific and quite achievable combination.
Getting this wrong is the most common source of disappointment. A fragrance can last fourteen hours and still feel like it is not working, because it sits close to the skin and the wearer wanted a room-filler.
The counterintuitive part
Higher concentration does not automatically mean more projection. It often means less.
Alcohol is what carries a fragrance outward. As it evaporates it lifts the aromatic materials with it, pushing them into the air. A more concentrated fragrance has proportionally less alcohol, so there is less carrying it away from the skin.
The result is that an extrait de parfum frequently sits closer to the body than an eau de parfum of the same scent, while lasting considerably longer. More fragrance, smaller bubble. We go through the full picture in extrait de parfum vs eau de parfum.
If you specifically want to be noticed across a room, a well-made eau de parfum can serve you better than an extrait. That is a genuine trade-off and worth knowing before you spend more expecting the opposite.
What actually controls each
Projection is driven by alcohol content, the volatility of the materials, how much you apply, where you apply it, and your body temperature. Warmer skin projects more.
Sillage is driven more by the specific materials than by concentration. Certain aroma chemicals are simply better at hanging in air. Ambroxan is one of the reasons so many modern fragrances leave a noticeable trail.
Longevity is driven by base notes and concentration together. It is a third property, and it is independent of the other two. This is why a fragrance can have all three, or any one without the others.
How to get more of either
For more projection, apply to warm pulse points, moisturise first, and spray onto skin rather than clothing. Do not simply add sprays, since past a certain point you stop being able to smell it yourself while everyone else can smell it too much.
For more sillage, spray hair and clothing as well as skin. Fabric holds fragrance longer and releases it as you move, which is exactly what sillage is. Test on an inconspicuous area first, because some oils stain.
For a skin scent, one or two sprays on the wrists, applied to dry skin rather than moisturised skin.
When strong projection is the wrong goal
In an office, on public transport, in a restaurant, or anywhere people cannot move away from you, high projection stops being impressive and starts being imposed.
Plenty of workplaces have fragrance policies for exactly this reason, and some people get migraines from strong scent. A skin scent is not a weaker choice in those settings, it is the correct one.
The other issue is that you stop smelling your own fragrance within minutes, which makes it very easy to over-apply while believing it has faded.
Common questions
What does sillage mean?
The trail of scent left in the air behind you as you move. From the French for a boat's wake.
Is sillage the same as projection?
No. Projection is the bubble around you when still. Sillage is what remains after you have passed.
How do I make my perfume project more?
Moisturised skin, warm pulse points, spray rather than dab. Adding more sprays has diminishing returns and a real downside.
Why does my perfume last but nobody notices it?
Good longevity, low projection. Common with high-concentration fragrances. Spraying some onto clothing will increase the trail.
Does more expensive fragrance project better?
No relationship. Some very expensive fragrances are deliberately built as skin scents.
The short version
Longevity, projection and sillage are three separate things. Decide which one you actually want before buying, because a fragrance can be excellent at one and unremarkable at the others.