Fragrance Creation Series Part 3: Structuring a Formula

A fragrance formula is more than an accord with extra ingredients. Once a blend grows, the challenge becomes structure: what creates the first impression, what carries the main identity, what gives depth, and what helps those parts feel connected instead of stacked on top of one another.

This is Part 3 of the DSH Fragrance Creation Series. It follows Part 2: How to Build a Fragrance Accord, where we created a focused scent idea that can now become the center of a larger composition.

The scent pyramid is a map, not a stopwatch

Top, heart, and base notes are useful teaching terms because they describe how different parts of a fragrance can be perceived over time. They should not be treated as three sealed compartments that switch on and off at exact minutes.

Materials overlap. A persistent material can be noticeable from the opening onward. A highly volatile material can influence the character of the heart even as it fades. Some materials function as bridges across several stages rather than belonging neatly to one layer.

The times shown in a scent-pyramid illustration are therefore best read as a visual teaching device, not a universal schedule. Your formula, material choices, dosage, substrate, temperature, and testing conditions can all change how development is perceived.

Top notes create lift and direction

The opening is where the fragrance establishes its first movement. Bright citrus, aromatic, green, fresh, fruity, and other high-impact effects are often used here, but “top note” describes a functional role more than a fixed ingredient category.

A good opening should point toward the fragrance rather than feel like a separate introduction pasted onto it. If the heart is soft and woody, an extremely sharp opening may need a bridge so the transition makes sense. If the heart is luminous and floral, the opening can reinforce that lightness.

The broader Perfumery collection can be useful when comparing materials by role instead of simply shopping by scent name.

The heart carries the identity

The heart is often where the central idea becomes easiest to recognize. Floral, spicy, aromatic, fruity, green, and many abstract effects can occupy this space, but the most important question is whether the middle of the fragrance still expresses the concept after the opening changes.

Your core accord may live primarily in the heart, or it may span the entire structure. A prepared accord from the Fragrance Accords collection can function as a central theme, while individual materials and prepared oils can be used around it to create contrast or support.

If the heart feels crowded, the problem may not be that it needs another material. It may need clearer hierarchy. Decide which element is the subject and which elements are supporting it.

The base provides depth and persistence

Base materials often contribute lasting woody, musky, amber, resinous, balsamic, sweet, earthy, or other grounding effects. But again, a base note is not invisible until the end. Many base materials are apparent from the first smell and help shape the whole fragrance.

The base should support the identity above it. A heavy, sweet base can pull a bright formula downward. A dry woody or musky base can make a floral idea feel more transparent. A rich resinous base can add density and warmth. There is no universally correct base; there is only the one that supports the fragrance you are trying to make.

Bridge the layers instead of stacking them

One of the most useful formulation ideas is the bridge: a material or mini-accord that shares qualities with two different parts of the fragrance.

A material with both citrus and floral character can help connect a bright opening to a floral heart. A floral-woody material can carry the heart into a woody base. A soft musk may sit underneath several sections and make them feel like parts of the same composition.

Bridging reduces the feeling that the fragrance changes scenes abruptly. It also lets you simplify. One well-chosen bridge can do more useful work than several decorative additions.

Think in roles, not fixed percentages

There is no universal percentage for how much of a formula should be top, heart, or base. Materials differ too much in strength, volatility, persistence, and function for a single ratio to fit every composition.

Instead, review the formula by role:

Core: What idea must remain recognizable?
Lift: What creates energy or immediate direction?
Support: What reinforces the core without competing with it?
Bridge: What helps different sections connect?
Depth: What gives body, texture, or persistence?
Contrast: What keeps the fragrance from becoming flat or predictable?

This framework is useful whether you are working with individual materials, prepared accords, or selected Fragrance Oils as components in experimental compositions.

Build outward from the core accord

Start with the accord you already understand. Add only what the larger fragrance needs. Make one structural change at a time and compare versions on labeled blotters.

If the opening disappears too quickly for your concept, that does not automatically mean “add more top notes.” The better solution might be a more persistent bridge that preserves the impression of brightness. If the base overwhelms the heart, the answer may be reducing or replacing one dominant base material rather than adding more heart materials to fight it.

Structural thinking keeps formulas readable. You should be able to explain why each major section exists.

From structure to finished format

At this point you have a concentrate or experimental blend, not necessarily a finished wearable perfume. The next step changes how the formula is perceived because dilution, resting, and the testing format all affect evaluation.

In Part 4: Dilution, Maturation & Testing, we will move from the concentrated formula into controlled test versions and discuss how to evaluate them without treating a single dilution percentage or resting period as a universal rule.