Understanding Notes

Essential Oil Foundations · Lesson 32

Understanding Essential-Oil Notes

Top, middle, and base notes help explain what you smell first, what forms the body of a blend, and what remains after the lighter aromas begin to fade. Notes do not determine an oil’s value, but they can help you create a blend that feels more complete and balanced.

Estimated time: 30–40 minutes Top, middle, base and bridge notes Includes a note-balance planner

Lesson progress Lesson opened

By the End of This Lesson

1

Understand the Notes

Recognize the general differences among top, middle, base, and bridge notes.

2

Understand Volatility

Connect an oil’s evaporation pattern with what is noticed first and what remains later.

3

Build Better Aromatic Balance

Use notes as one part of blend design without ignoring chemistry, purpose, route, or the individual dog.

What Is an Essential-Oil Note?

An essential-oil note is an aromatic classification based largely on how quickly the oil’s aroma becomes noticeable, how quickly it evaporates, and how long it remains perceptible within a blend.

The note system is often represented as a pyramid. The lightest and most volatile aromas sit at the top. Middle notes form much of the body of the blend. Slower, heavier aromas form the base.

Top Notes First impression · lighter · faster to evaporate

Middle Notes Heart of the blend · connects and rounds

Base Notes Depth · grounding · slower and longer lasting

Note classifications are useful guides, not perfectly fixed scientific boxes. Different aromatherapists may classify the same oil as top-middle, middle, or middle-base depending on the oil, batch, constituent profile, and how the aroma is perceived.

Notes Are About Aromatic Behavior

Not Chemical Families

A note is not the same thing as calling an oil an ester, alcohol, monoterpene, phenol, or sesquiterpene.

Not Therapeutic Rank

A base note is not stronger or more valuable than a top note. It simply behaves differently in the aromatic structure.

Not a Complete Formula

A blend can contain top, middle, and base notes and still be poorly suited to the goal or dog.

Notes help shape the aroma. Chemistry, purpose, amount, route, and the individual dog shape the complete plan.

Top Notes

The first aromatic impression

Top notes are generally light, bright, fresh, and highly volatile. They often reach the nose quickly and may fade sooner than the rest of the blend.

Often Described As

Bright Fresh Citrusy Minty Lifting

Common Examples

Lemon, Lime, Grapefruit, Orange, Bergamot, Peppermint, Spearmint, and some Eucalyptus oils

Common Role

Opens the aroma, creates the first impression, adds freshness, and may lift a blend that feels too heavy.

Middle Notes

The heart and body of the blend

Middle notes often become more noticeable after the fastest top notes begin to soften. They can connect the lighter and heavier parts of the formula.

Often Described As

Round Herbal Floral Balanced Full

Common Examples

Lavender, Geranium, Rosemary, Tea Tree, Roman Chamomile, Basil, Marjoram, and many floral or herbaceous oils

Common Role

Forms the center of the blend, links the other notes, and often carries much of the formula’s recognizable character.

Base Notes

Depth, grounding, and lasting aroma

Base notes are generally slower to evaporate. They may be less obvious in the first moment but become more noticeable as the lighter aromas fade.

Often Described As

Deep Woody Earthy Grounding Anchoring

Common Examples

Vetiver, Patchouli, Myrrh, Cedarwood, Sandalwood, and oils often described as Frankincense or Ylang Ylang middle-base notes

Common Role

Adds depth, anchors lighter aromas, and helps the blend retain a recognizable aromatic foundation.

What Happens to the Aroma Over Time?

A blend is not always experienced as one unchanging smell. Its aromatic balance may shift as more volatile constituents evaporate and slower constituents remain.

First

Initial Aroma

Top notes and especially dominant oils may be most noticeable.

Soon

Blend Opens

Middle notes begin to appear more clearly as the sharpest first impression softens.

Later

Heart Remains

The central character of the blend may become easier to recognize.

Last

Base Remains

Heavier, slower notes may remain after lighter aromas have faded.

This is why a blend should be evaluated when it is first made and again after it has rested. The first smell may not be the final aromatic balance.

Bridge Notes: Connecting the Blend

Some oils sit between categories and act as bridges. A top-middle oil may connect a bright opening to the heart of the blend. A middle-base oil may connect the body of the blend to its deeper foundation.

Top-Middle Notes

These may still feel fresh and noticeable early but remain longer than a very light citrus note.

Examples may include Lavender, Tea Tree, Rosemary, or certain mint and herbaceous oils depending on the source and profile.

Middle-Base Notes

These may contribute to the heart of the blend while also creating depth and greater aromatic persistence.

Examples may include Frankincense, Cedarwood, Ylang Ylang, or some woody and resinous oils.

A bridge note can be useful when a blend smells as though the bright, herbal, floral, and earthy parts do not belong in the same recipe.

Equal Drops Do Not Mean Equal Aromatic Strength

Three oils may each receive one drop, yet one can dominate the complete blend. Aroma strength depends on more than the number of drops.

1 drop of a soft oil

1 drop of a bright oil

1 drop of a dominant oil

Intensity

Some oils are noticeable in extremely small amounts.

Volatility

Highly volatile oils may dominate the first impression.

Familiarity

A familiar or emotionally charged aroma may stand out more.

Individual Perception

The dog or person smelling the blend may notice different parts of the formula.

Do not keep adding more of every other oil simply to overpower one dominant ingredient. Sometimes the cleaner solution is to reduce or remove the dominant oil.

Do You Need All Three Notes?

No. A therapeutic blend does not have to include a top, middle, and base note simply to be considered complete.

Top-Heavy Blend

May feel bright, fresh, energizing, or highly noticeable at first but may fade more quickly.

Middle-Heavy Blend

May feel rounded, herbal, floral, balanced, and centered around the main purpose.

Base-Heavy Blend

May feel deep, earthy, grounding, slower, and more persistent.

A blend for respiratory support, cleaning, or a brief diffuser session may intentionally contain mostly top and middle notes. A bedtime or grounding blend may lean more heavily toward middle and base notes.

Aromatic balance does not always mean equal balance.

A Practice Framework—not a Required Formula

Some formulators begin with a structure containing a larger middle portion, a noticeable top portion, and a smaller base portion. One simple practice ratio is:

3

Top

Opens and brightens

5

Middle

Forms the heart

2

Base

Adds depth and anchors

A 3:5:2 note structure is only a learning framework. It is not a dog-specific dilution, a required therapeutic ratio, or proof that the selected oils belong together.

Notes and the Order of Adding Oils

Notes can guide the way you evaluate and build an aroma, but there is no universal rule that the oils must enter the bottle in note order for the blend to become active.

Precision-First Workflow

Begin with the oil used in the smallest amount or the oil that would be most wasteful to overpour.

• Reduces loss after a counting mistake
• Useful for strong oils used sparingly
• Supports accurate formula replication

Aroma-Building Workflow

Begin with the base or anchoring oil, add the middle notes, and finish with the lighter top notes.

• Allows the aromatic foundation to be evaluated first
• Useful for perfume-style or emotional blending
• Helps identify what brightens or softens the base

Both workflows are valid. Choose one based on the formula, write the recipe first, and record any adjustment.

How to Evaluate a New Blend

Smell the Individual Oils Confirm that the chosen oils still fit the goal and the dog before combining them.

Use a Scent Strip or Separate Test Surface Experiment with a small aromatic trial before making a larger finished formula.

Smell From a Respectful Distance Do not place a fresh concentrated blend directly beneath the dog’s nose.

Notice the First Impression Identify what appears first, what dominates, and whether anything feels sharp or disconnected.

Allow the Blend to Rest Recheck it after several hours and again the next day when aromatic balance matters.

Change One Thing at a Time Adjust one oil or one drop amount, then record and reevaluate.

When a Blend Feels Unbalanced

The Blend Feels Too Sharp or Bright

The formula may contain a dominant top note or several highly volatile oils competing for attention.

• Reduce the sharpest top note.
• Add or strengthen a compatible middle note.
• Consider a small amount of a grounding base note.
• Allow the blend to rest before changing it repeatedly.

The Blend Feels Too Heavy or Muddy

Too many deep or strongly persistent oils may make the formula feel dense, dull, or difficult to separate aromatically.

• Reduce one of the overlapping base notes.
• Add a compatible top or top-middle note.
• Remove oils that perform the same job.
• Simplify before adding another ingredient.

The Blend Smells Like Separate Ingredients

The oils may lack a connecting middle or bridge note, or one oil may sit outside the aromatic character of the others.

• Look for a compatible bridge note.
• Adjust the proportion of the disconnected oil.
• Confirm that the oil belongs for more than one theoretical reason.
• Allow time for the aroma to integrate.

The Blend Disappears Too Quickly

A formula made primarily from highly volatile top notes may provide a bright but brief aromatic experience.

• Add a compatible middle or base note.
• Consider the application method.
• Consider whether a carrier or passive-diffusion format fits.
• Do not add a base note only for longevity if it conflicts with the goal.

Therapeutic Blending Versus Perfume Blending

Therapeutic Priority

The oils are selected first for the wellness, emotional, physical, environmental, or bodywork goal.

• Purpose leads the formula
• Aroma still affects acceptance
• Not every note category is required
• Route and amount remain central

Aromatic or Perfume Priority

The formula is structured primarily around aroma development, complexity, balance, and how it changes over time.

• Notes may guide the structure more strongly
• Aromatic transitions receive greater attention
• Resting and repeated smelling are especially important
• Therapeutic properties may still influence selection

For dogs, a beautiful aroma that overwhelms or is rejected is not a successful blend.

Lesson Activity: Build a Note Profile

Enter up to five oils, the number of drops, and the note you assign to each. The planner will show how much of the formula comes from top, middle, and base notes.

Blend name Intended aromatic character Choose one Bright and uplifting Balanced and rounded Grounding and deep Fresh and respiratory Soft and calming Purpose-led rather than note-balanced

Oil 1 Drops Note Choose note Top Middle Base

Oil 2 Drops Note Choose note Top Middle Base

Oil 3 Drops Note Choose note Top Middle Base

Oil 4 Drops Note Choose note Top Middle Base

Oil 5 Drops Note Choose note Top Middle Base

Aroma notes and dog response

Analyze Note Balance Clear Planner

Check Your Understanding

1. What does an essential-oil note primarily describe?

The oil’s price Its aromatic behavior, volatility, and persistence The only body system it can support

2. Which note is generally noticed first and fades more quickly?

Base note Middle note Top note

3. What is the usual role of a middle note?

To form much of the heart and body of the blend To guarantee medical effectiveness To make every blend smell citrusy

4. What may a base note contribute?

Only the first bright impression Depth, grounding, and longer aromatic persistence Automatic dilution

5. Do equal numbers of drops guarantee equal aromatic strength?

Yes. One drop always has the same aromatic impact. Yes, but only in amber bottles. No. Some oils are more dominant, volatile, or noticeable.

6. Must every therapeutic blend contain top, middle, and base notes?

No. The goal may call for a different note balance. Yes. Otherwise the oils cannot work.

7. Why might a blend be evaluated again the next day?

The oils do not exist until they rest overnight. The aromatic balance may change as the formula integrates. Resting guarantees synergy.

8. What should happen when one oil dominates the blend?

Add every other oil in larger amounts. Assume the formula is perfect. Consider reducing the dominant oil or adjusting one part at a time.

Check My Answers

The Big Takeaway

Top notes create much of the first impression. Middle notes form the heart of the blend. Base notes add depth and tend to remain longer. These categories help shape aromatic balance, but they do not replace chemistry, purpose, route, amount, or the dog’s response.

Mark Lesson Complete

Previous: Creating Essential-Oil Blends Next: Raindrop Technique and Its Chemistry

The next lesson brings chemistry, layering, sequence, application methods, aromatic character, and bodywork together through Raindrop Technique.

Bring your blending and aromatic-note questions to the member conversation

Educational content only. Statements have not been evaluated by the FDA. This content is not intended to diagnose, treat, cure, or prevent disease and is not medical advice.