Essential Oils and Concretes: An Introduction to Modern Incense-Blending Materials

When using modern materials for incense blending, first distinguish five categories: essential oils (distilled/cold-pressed, fully volatile), absolutes (solvent-extracted, containing waxes), concretes (containing non-volatile components, viscous), oleoresins (solvent extracts of resins), and tinctures (alcohol infusions).A brief set of usage principles:Essential oils are responsible for "top notes and penetration," while concretes/oleoresins are responsible for "tenacity and body"; the two are complementary. In powdered incense blends, liquid materials are usually kept at 1%–5%; excess will "float" on the surface and smell like synthetic fragrance.

Key Points

• Essential oils: obtained by steam distillation or cold pressing, fully volatile, leaving no residue; the aroma is bright but short-lasting.
• Absolutes / Concretes: obtained by solvent extraction, containing waxes and non-volatile components; viscous, rich in aroma, and long-lasting.
• Agarwoodessential oilis clear, well-layered, and fast-volatilizing, whereas agarwoodconcreteis thick, sweet, and heavy, with long tenacity—they are not the same thing.
• There are three methods for adding liquid materials to powdered incense blends:dropwise addition, carrier adsorption, and emulsification。
• Iron rule for dosage:better less than more. Essential oils at 1%–5% of the total powder weight are sufficient; above 8% will inevitably cause "floating aroma."
• Safety: essential oilsmust not be taken internally and must be diluted before skin contact. They are flammable liquids; use with caution around pregnant women, infants, and pets.

I. Essential Oils and Extracts for Incense Blending: Five Types of Materials Clarified in One Table

One-line summary:Essential oil is "steamed out," concrete is "soaked out."The former carries away only molecules that can escape with the steam, while the latter takes waxes, resins, and pigments along with it—so concrete is thicker, stickier, and longer-lasting, but also more prone to smelling "muggy."

II. Agarwood Essential Oil vs. Agarwood Concrete: Not the Same Thing

This is the most frequently asked question on this site, so it deserves its own section.

Agarwood essential oil, obtained from agarwood (usually scraps, hook threads, or fermented wood powder) via steam distillation or supercritical extraction. Characteristics:

• Color ranges from pale yellow to deep amber, with good flowability;
• Aromaclear and distinctly layered, and once placed on the burner the top, middle, and base notes are clearly defined;
• volatilizes quickly, so if burned alone it basically dissipates within twenty minutes to an hour;
• its components are mainly chromones and sesquiterpenes, with relatively low boiling points.

Agarwood concrete, obtained by extracting agarwood with a solvent (commonly ethanol or petroleum ether) and then removing the solvent. Characteristics:

• a viscous paste, dark in color, almost black-brown;
• aromadense, sweet and thick, with woody and honeyed notes；
• extremely long-lasting and can serve as a fixative;
• contains non-volatile resins and waxes, so placing it directly on the burner easily scorches it; it needs dilution or to be used in combination.

The price gap between the two is large, and their uses differ as well.If you want clear aroma layers, use the essential oil; if you want to extend longevity, use the concrete; using both gives the best effect— this is also standard practice in professional incense blending.

The English site's articleOud Oil vs Agarwood Chipshas a more detailed comparison of the differences between "agarwood oil and agarwood chips" and can serve as further reading.

III. How to use liquid materials in powdered incense blends

Traditional incense blending uses only solids (powder, honey, resins), while modern practice adds the liquid route. Three ways to incorporate:

Method 1: Drop method (simplest)

At the blending stage, drip the essential oil by the drop directly into the already mixed incense powder, then knead evenly.Suitable for making incense balls and incense cakes. Note: the essential oil should be added to the honey doughAfter cooling to room temperatureadd again, otherwise the high heat will drive off all the top notes.

Reference dosage: per 100 g of dry powder, essential oil1–3 ml(about 20–60 drops).

Method 2: Carrier adsorption method (most uniform)

First drip the essential oil onto the carrier powder (commonly usedsandalwood powder, agarwood powder, or food-grade maltodextrin). Let it sit for 24 hours so the carrier is fully saturated, then mix with the other powders. This gives the most uniform distribution of essential oil, avoiding the situation where “a particular incense pill is especially pungent.”

Use this method for making incense sticks and seal-burning incense (zhuangxiang).

Method 3: Emulsification method (most professional)

Use a small amount of alcohol or a solubilizer to disperse the essential oil first, then mix with the powder. Suitable for formulas with a higher essential oil ratio (above 5%). For home operation, you don’t have to insist on this; methods one and two are sufficient.

IV. Iron rule of dosage: better less than more

When beginners use essential oil, nine times out of ten it’sadded too much。

The sign of adding too much is “floating fragrance” — the aroma floats on the surface, thin and pungent, makes you dizzy after smelling it for a while, and has no layering at all. This is because essential oil molecules volatilize too quickly and escape on their own outside the whole incense, without blending with the powdered incense materials.

Reference dosage range(as a percentage of total powder):

concrete / resinoidcan be slightly higher, usually at3%–10%, because its role is to fix the scent and increase thickness, not to enhance the aroma. However, concrete is viscous and easily clumps when directly kneaded into powder; it is recommended to first dilute with a small amount of alcohol to a flowing state before adding.

V. List of Common Materials (Modern Incense Blending)

Fixing scent deserves a separate mention: the biggest shortcoming of essential oils is that they evaporate quickly, while traditional blended incense relies on honey and resins as natural fixatives. In modern formulas, adding3%–5% benzoin concrete or vetiver essential oil, can more than double the overall longevity. This is the most practical technique combining traditional methods with modern materials.

VI. Procurement and Pricing (subject to market fluctuations, for reference only)

The above are publicly available market price ranges, subject to market fluctuations and for reference only, actual prices vary item by item.

Three tips to avoid pitfalls when purchasing

1. If "agarwood essential oil" is priced as low as a few dozen yuan for a large bottle, it is basically a synthetic fragrance blend.The raw material cost of genuine agarwood essential oil is what it is; an unreasonably cheap price must have a reason.
2. Check the label: Reputable products state the Latin scientific name, origin, extraction method, and batch number. Be cautious if it only says "agarwood essential oil."
3. Wild populations of Aquilaria are listed in CITES Appendix II, cross-border trade requires permits, and sourcing should use traceable channels.

VII. Safety Precautions (Please Read to the End)

Essential oils arehighly concentratedaromatic substances, completely different from incense powder, and safety rules are far stricter.

• Do not take internally. Essential oils are extremely concentrated; accidental ingestion can cause poisoning. This is not incense material, nor medicine.
• Do not apply directly to large areas of skin. Use diluted in a carrier oil; sensitive individuals should first do a small patch test.
• Flammable liquid. Most essential oils have low flash points; store away from heat sources and open flames, and keep out of reach of children.
• Use with caution around pregnant women, infants and young children, epilepsy patients, and pets (especially cats). Some essential oils pose clear risks to these groups.
• Store refrigerated and protected from light. Essential oils are sensitive to light, heat, and oxidation; keep them in dark glass bottles in a cool place and use them up as soon as possible after opening.
• Keep ventilated when burning incense. Overly concentrated diffusing of essential oils can cause dizziness and nausea; do not diffuse for long periods in enclosed spaces.

Blending incense is an elegant pursuit, but safety is the bottom line. This section may seem wordy, but every point has actually caused incidents.

VIII. Ancient Methods and Modern Methods Do Not Actually Conflict

Some incense friends ask: Does using essential oils count as "inauthentic"?

The shopkeeper's view is:The ancients used honey and resins to fix scents because those were the only materials available then; today we have better scent-fixing methods, so there is no reason not to use them.What truly needs to be preserved is the structural thinking of "sovereign, minister, assistant, and envoy," the patience of "sealing and storing until the fragrances meld," and the sense of proportion of "less rather than more"—none of which has anything to do with whether you use powder or oil.

Two years ago a young woman who formulates fragrances came to the shop, bringing a bottle of agarwood blend essential oil she had mixed herself. She said she could never achieve the "depth" she wanted. The shopkeeper smelled it: the top note was excellent, but the tail was empty. He added two drops of benzoin concrete, let it sit for a week, and then smelled it again—she was stunned on the spot and said, "That's just what was missing."With just 2% more fixative, the lasting power went from twenty minutes to one hour.This is what modern materials bring to incense blending (合香): not replacing the old methods, but making up for their shortcomings.

Want to try adding essential oils to your incense blends? The shop carries agarwood essential oil, concrete, and matching incense powder; you can mix and compare on-site. If it's inconvenient to come out, call400-809-1913Tell us the scent profile you want to make, and the shopkeeper will give you a blending ratio idea.

Frequently Asked Questions

Essential oil or concrete—which one should you choose?

It depends on what you want. Essential oil is obtained by distillation; it fully volatilizes, its aroma is clear and well-layered, and it has short lasting power—suitable for top notes and brightening. Concrete is obtained by solvent extraction; it is viscous and waxy, its aroma is rich, sweet, and dense, and it has long lasting power—suitable for adding depth and fixing the fragrance. The professional approach is to use both—essential oil handles the front, concrete handles the back. If using only one: choose essential oil for layering, choose concrete for longevity.

How much essential oil is appropriate in an incense blend?

Less rather than more. As a percentage of total powder weight: 1%–2% to lift the top note, 3%–5% to strengthen the main body, and no more than 8% in strong-scent formulas. Above 8%, "floating fragrance" occurs—the aroma floats on the surface, thin and pungent, with no layering, because the essential oil volatilizes too quickly and fails to meld with the powdered incense materials. It is recommended to add the essential oil after the blend is mixed, when the honey dough has cooled to room temperature, to avoid driving off the top notes with heat.

Can essential oil be applied directly to the skin?

No. Essential oil is a highly concentrated substance and must be diluted in a carrier oil before contacting the skin; those with sensitive constitutions should first do a small patch test. In addition, essential oil must not be ingested; it is a flammable liquid and should be stored away from heat sources, and should be used with caution around pregnant women, infants and young children, and pets (especially cats). Keep ventilation during use; do not diffuse at high concentration in enclosed spaces for long periods. The statements in this article concerning aromatic use are general common-sense reminders,not medical advice, for reference only。

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