Most beginners mix a few drops, spray it on, and call it done. Then the scent vanishes in forty minutes and they blame the oils.
The oils weren’t the problem. The structure was.
Understanding perfume notes — top, middle, and base — is the single thing that separates a blend that lasts all day from one that evaporates before lunch. Fragrance works in layers. Top notes hit first and disappear fastest. Middle notes are the body, what the scent actually smells like when it’s on your skin. Base notes anchor everything and are still there six hours later. Miss one of those layers, or load them in the wrong proportions, and you’ll always end up with something that smells sharp out of the bottle and like nothing by lunch.
This is the part most beginner guides skip. Once you understand note structure, every blend gets better — because you’ll know why you’re reaching for each oil, not just that it smells good on its own.
If you want the full foundation first, read our complete beginner’s guide to making perfume at home. This post goes deeper on one specific piece of it.
What are fragrance notes?
Fragrance notes are the scent layers in a perfume, organized by when they appear and how long they last. The word “note” comes from music — the way a chord has multiple tones sounding at once, a perfume has layers unfolding over time.
The three categories are top, middle, and base. Each has a different evaporation rate, which is why a fragrance smells one way in the bottle, different ten minutes after you spray it, and different again at the end of the day.
That shift isn’t a flaw. It’s the design.
Top notes: the first impression
Top notes are what you smell first — the sharp, bright opening of a fragrance. They’re made of light molecules that evaporate quickly. Most top notes last 15 to 30 minutes on skin before fading and letting the heart come through.
They’re the hook. But they’re not the whole story, and overloading them is one of the most common blending mistakes.
From the six oils in the Scent + Art kit, two sit in the top note position:
- Citrus: Bright and energising. Citrus molecules are among the fastest-evaporating in perfumery, which is exactly why they work as an opening. This oil gives your blend its immediate energy — the thing that makes someone turn their head. It won’t last all day, but that’s the point.
- Clean: Fresh and crisp. Clean reads as a top-to-early-middle note depending on concentration. At lower amounts it opens a blend without dominating it, more like cool air than a statement.
The mistake people make: they use too much top note because it smells great in the bottle. By the time the finished perfume is on skin, the top has already faded. If you overdid it, the balance underneath is off.
Middle notes: the heart
Middle notes (heart notes) emerge after the top fades, usually within 20 to 60 minutes, and they carry the scent for the next several hours. This is the personality of the fragrance. They need to be interesting on their own, work with the base underneath, and not clash with whatever’s opening above them.
From the kit, three oils live here:
- Calm: Soft, floral, and peaceful. The most classically “perfume” of the six oils. It reads as a traditional heart note — the kind of thing you’d find at the center of a feminine-leaning or unisex fragrance. It smooths out sharper elements and adds elegance without announcing itself.
- Sugar: Sweet and warm, comforting without going cloying at the right ratios. Sugar is a connector. It bridges bright top notes and heavier base notes without creating a hard shift. Use too much and it reads as candy. Use the right amount and it makes everything around it smell better.
- Salt: Invigorating, oceanic, slightly mineral. Salt is versatile. It can function as a top note at high concentration or a middle note at lower concentration — more diffuse and airy. In the heart position it adds depth and a faint aquatic lift that stops a blend from going too heavy.
Base notes: the anchor
Base notes are the foundation. Heavy, slow-evaporating molecules that don’t announce themselves in the first spray. They take time to develop on skin and then they stay. A good base note is still there 6 to 8 hours later.
Without base notes, a blend floats away. They also act as fixatives — slowing the evaporation of everything above them. More base in a blend means the whole fragrance lingers longer.
From the kit, one oil is built for this role:
- Woods: Creamy, sophisticated, and grounding. Sandalwood-adjacent. This oil sits quietly under everything else, adding warmth and depth without competing with the heart. It’s why a blend that smelled light and citrus-forward in the morning feels richer and warmer by afternoon — the top notes have gone, the base has come forward.
The 30/50/20 ratio
Here’s how to actually apply this.
The 30/50/20 ratio is the standard starting point in perfumery:
- 30% top notes
- 50% middle (heart) notes
- 20% base notes
In practice: if you’re making a 10ml perfume with 2ml of total fragrance oil (a 20% concentration), that works out to approximately:
- 0.6ml top notes, about 12 drops
- 1.0ml middle notes, about 20 drops
- 0.4ml base notes, about 8 drops
The ratio maps to evaporation rate. You use the most middle note because the middle is where most of the scent life happens. You use less base because heavy molecules are potent. A few drops of a good base oil will hold up a whole blend. You use the top note modestly, because it fades fast and a heavy hand throws off everything underneath once it’s gone.
Adjust from there. More base if you want the scent to last longer. More top if you want something lighter and fresher. But if a blend isn’t working, check the ratio first. Nine times out of ten it’s too much top and not enough base. For a comprehensive look at making blends last all day, read How to Make Homemade Perfume Last Longer.
A worked example: one blend using all six oils
Here’s a complete formula — a warm, grounded scent with a bright opening. We call it the Evening Amber build.
Target: 2ml of fragrance oil at 30/50/20, in a 10ml bottle
Top notes, 0.6ml / ~12 drops:
- Citrus: 8 drops
- Clean: 4 drops
Middle notes, 1.0ml / ~20 drops:
- Calm: 9 drops
- Sugar: 7 drops
- Salt: 4 drops
Base notes, 0.4ml / ~8 drops:
- Woods: 8 drops
Add the oils to your spray bottle in order (top to base), top up with perfumer’s alcohol to 10ml, cap it, and leave it for 48 hours. The alcohol integrates, the notes start working together, and the scent shifts noticeably — usually toward something rounder and more coherent than it was on day one.
On skin: Citrus opens it. Clean keeps the opening from going immediately sweet. Calm and Sugar form the warm floral heart. Salt stops the heart from going too soft. Woods holds the whole thing together as the top notes clear.
None of that is accidental. It’s the structure working.
To understand how we settled on these specific six oils and why the combination covers so much creative ground, read how we chose the six oils in our kit. If you have more questions about the process, 13 Questions Every Beginner Actually Asks covers the full range honestly.
Get the kit and start blending
The Scent + Art Signature Collection kit includes all six oils — Citrus, Sugar, Calm, Woods, Clean, and Salt — plus three crystal spray bottles, a dropper, perfumer’s alcohol, and a step-by-step recipe card for your first blend. Everything you need to put this into practice. $44.99.
FAQ: Perfume Notes
What are the three types of perfume notes?
Top notes, middle (heart) notes, and base notes. Top notes are the bright, fast-evaporating opening of a fragrance — citrus, light herbs. Middle notes are the body, lasting 1 to 3 hours — florals, light musks, warm sweets. Base notes are the foundation, slow to emerge but long-lasting — woods, resins, amber. Every complete perfume has all three layers working together.
How do I know if my perfume has enough base notes?
The test is simple: if your blend disappears within 90 minutes of application, your base is too thin. Apply to pulse points and evaluate at 30 minutes, 1 hour, and 3 hours. If the scent is already faint at the 1-hour mark, increase your base note by 20 to 30% in the next batch. In our palette, Woods is the primary base note — don’t go below 3 drops in a 10ml bottle.
Can a single oil function as more than one note type?
Yes, depending on concentration. Salt in our palette is a good example — at high concentration it reads as a brisk top note. At lower concentration in a blend, it functions more as a diffuse middle note. Concentration changes how and when a molecule releases on skin, which is why “top/heart/base” is a guide, not an absolute rule.
Why does my perfume smell different on my skin than in the bottle?
Because you’re only smelling top notes and alcohol in the bottle. On skin, body heat activates all three note layers in sequence. The wet spray is top notes. Ten minutes in is the heart. An hour in is the base. The on-skin drydown — not the bottle sniff — is the real perfume. Always evaluate on your wrist, not from the cap.