How do you test a perfume's longevity and projection?
Longevity is how long a perfume stays on you, projection is how far it reaches. A repeatable way to test both with a sample, with no stopwatch and no promises.
How do you test a perfume's longevity and projection? Apply one spray to clean skin, smell it at the same points of the day, ask someone to smell it at arm's length, and compare it with a second perfume tested in the same way. Longevity is how long the scent stays on you. Projection is how far it reaches. Neither is a fixed property of the perfume, because skin, weather and the way you wear it all change the result, so the goal of the test is a fair picture of how it behaves on you.
Set up a fair test
Use clean skin with no lotion or other perfume, apply one spray to the inside of the forearm, and write down the date, the weather and what you did that day. Use the same spot and the same number of sprays each time. If you test two perfumes, put one on each arm and swap on another day. Do not rub, do not cover the spot with clothing at first, and try not to eat or drink anything with a strong smell. The base routine is in how to test perfume on your skin.
Longevity: smell at set moments
Choose four moments that fit your day, for example after the perfume has settled in the morning, around midday, in the late afternoon and in the evening. Smell the spot at each one and write one line: strong, faint, or only when close to the skin, and what you notice in the character. Your nose adapts to a steady scent, so smell the crook of your elbow or another spot too, and read why you cannot smell your own perfume if a perfume seems to vanish suddenly. The test ends when you can no longer smell the perfume with your nose against your skin.
Projection: ask someone
You are the worst judge of how far your perfume reaches, because you are right next to it. Ask a friend to smell at arm's length, and then a little farther away, when you walk past or when they sit across the table. Their answers are rough but more useful than your own. A perfume that others only notice when they lean in is close-wearing. One they notice as you walk into the room has wide reach. Neither is better; they suit different places.
Four perfumes, four profiles
Rasasi Hawas Ice is tagged strong in our records and recorded with apple, Italian lemon, Sicilian bergamot and star anise on top, plum, orange blossom and cardamom in the heart and musk, amber, driftwood and moss in the base.
Rayhaan Cedrus Blanc is tagged moderate, with a short list of bergamot, musk and cedar. Juliette Has a Gun Musc Invisible is tagged light and recorded with jasmine absolute, cotton flower and white musk. Mykonos Marbella, an Extrait de Parfum, is tagged strong and recorded with orange, lemon, passionfruit and mango on top, frangipani, solar notes and blackcurrant in the heart and vanilla, benzoin, musk and labdanum in the base.
These tags describe how the perfumes are built, not how long they will stay on you, and that is the point of the test. Try a light and a strong perfume side by side and you will see what the words mean on your own skin.
Read the result
At the end you have a short log of moments and a friend's remarks. Look for patterns. Does the scent seem to vanish at the same point each time? Does it change character, becoming warmer or flatter? Did it reach farther in warm rooms? A perfume that is quiet but steady may suit an office, and one with wide reach may suit an evening out. For context on the reasons a perfume fades, see why does my perfume fade so fast, and for ways to hold a scent, how to make perfume last longer on skin.
Where to go next
Testing takes more than one vial of attention, so a 5 ml or 10 ml sample works better than 2 ml; which sample size compares them. To see everything we fill, browse all samples or the light and strong ranges. The FAQ answers practical questions.
FAQ
What is the difference between longevity and projection?
Longevity is how long you can still smell a perfume on your skin. Projection is how far from your skin other people can smell it. A perfume can be strong in one and modest in the other.
What is sillage?
Sillage is the trail a perfume leaves in the air as you move. It is closely related to projection and is mostly a word for how noticeable your perfume is to others.
Do I need a stopwatch?
No. Smell it at set points in your day, write one line each time and compare with another perfume tested the same way. That gives you a fair picture without a timer.
