SESH · FRAGRANCE ACADEMY · INTERMEDIATE
Distinguish and assess near-field projection, scent trail and endurance.
Particles spread from higher to lower concentration. This is a qualitative model, not a perfume longevity timeline or a measured skin absorption rate.
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Three distinct questions
Projection concerns detectability around a stationary wearer at a given distance; sillage concerns the scent trail associated with movement; longevity concerns how long the scent remains detectable in a defined test. They are perceptual properties, not standardized laboratory meters. Strong close-up odor does not guarantee a pronounced moving trail.
Test projection with an observer
Apply a consistent quantity of a finished product according to its directions. Ask a consenting observer to assess detectability at selected distances and repeated times, in a reasonably stable environment. Repeated extra sprays invalidate dose comparability. An observer must be free to report that they detect nothing; avoid turning the procedure into a forced guess.
Assess a trail, not merely intensity
A scent trail requires movement and an external observer, not merely sniffing your wrist. Air currents and enclosed versus open spaces alter detectability, so record the setting. A memorable passing trail tells you little about whether the fragrance will remain noticeable on skin several hours later.
Follow the route from the nasal cavity to the olfactory bulb. Smell is perception; it does not independently identify a perfume’s ingredient list.
Adaptation and application dose
Nose-blindness can make a fragrance seem absent to its wearer even when others perceive it. Before increasing dose, ask a fresh observer. Your perception remains useful data but is not the whole picture. Strong initial projection is not a guarantee of longevity; if others find the fragrance intrusive, reduce application.
Worked example: two different performers
Scent A is noticed from a meter away at ten minutes but not after four hours. Scent B stays close to skin but remains detectable at six hours. Neither is universally 'stronger'. Give projection distance, approximate trail and skin detectability separate scores along with the observation time.
The social context matters
In workplaces, transport and crowded settings, proximity and ventilation affect appropriate use. Choose the lowest effective application for your purpose and avoid unsolicited projection experiments around fragrance-sensitive people. Performance assessment is not a contest to fill a room.
Practice challenge
With a consenting observer, compare projection at 15 minutes, movement-related trail and detectability at two and four hours. Record ventilation.
Key concept map
Three performance dimensions
- Projection: stationary range
- Sillage: trail in motion
- Longevity: detection duration
A fair test
- Consistent dose
- Independent observer
- Distance and checkpoint
- Setting and airflow
Try the analysis on SESH fragrances
These are optional references for comparison, not evidence of a specific ingredient or superiority claim.
Further reading
The Perfume Society: fragrance FAQs · IFRA fragrance standards
