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Tonka Bean

MUSK, AMBER, ANIMALIC SMELLS / gourmand · warm · tobacco

Tonka Bean

Category	MUSK, AMBER, ANIMALIC SMELLS
Subcategory	gourmand · warm · tobacco
Origin
Volatility	Base Note
Botanical	Dipteryx odorata
Appearance	dark brown solid
Odor Strength	Medium
Producing Countries	Venezuela, Brazil (Pará, Amazonas), Guyana, Colombia, Suriname, Trinidad
Pyramid	Base

Dried hay, bitter almond skin, tobacco leaf curling in the shade. Tonka bean is the smell of a page left inside a closed book for decades — warm, sweet, faintly powdery, never cloying.

Scent
Terroir & Origins
The Full Story
Fun Fact
Extraction & Chemistry
In Perfumery

Scent

Warm hay and bitter almond, with a powdery dryness that separates it from vanilla immediately. Where benzoin is balsamic and dense, tonka is lighter, more atmospheric — closer to the smell of sun-warmed straw than to resin. A faint coconut-lactonic sweetness (dihydrocoumarin) sits in the background, and on fabric, the dry-down leaves a tobacco-leaf and old-book impression that persists for days. Less sweet than vanillin, less smoky than guaiacol, less sharp than heliotropin. Tonka occupies the quiet space between them.

Evolution over time

Immediately

A faint green-herbal sharpness, almost grassy. The gourmand warmth has not arrived yet. A slight bitter-almond edge and hay-like transparency begin to emerge within the first minutes.

After a few hours

Full coumarin body: dried hay, warm almond skin, caramel undertone without syrupy sweetness. A tobacco-leaf warmth develops alongside a soft coconut-lactonic facet from dihydrocoumarin. Powdery, enveloping, deeply tenacious.

After a few days

A quiet, warm, sweet-powdery trace on fabric and skin. The tobacco and hay facets persist longest. The almond bitterness fades, leaving a clean, dry sweetness — like old paper or pressed autumn leaves. Substantivity on textile can exceed 400 hours.

Origin, Ethics & Substitutes

Indicative 2025 wholesale prices.

The Full Story

Tonka bean is the seed of Dipteryx odorata (Fabaceae), a tropical tree native to northern South America — principally Venezuela, Colombia, Brazil. The cured beans are dark, wrinkled, almond-shaped, and carry a distinctive dried-hay, vanilla-tobacco, slightly bitter-almond aroma owing principally to coumarin (CAS 91-64-5) [A], which can crystallise on the surface of fresh beans as a white efflorescence.

Chemistry

Tonka bean absolute (solvent-extracted, CAS 8046-22-8) contains 25–50% coumarin alongside hydroxycoumarins, β-caryophyllene, eugenol, and a small fraction of fatty acids and other minor constituents. The dried-hay character is essentially the coumarin signature; vanillin and ethyl vanillin amplify the vanilla angle.

Safety

Coumarin is restricted under IFRA's 51st Amendment as a potential skin sensitiser; category-specific limits apply (typically below 1.5% in leave-on Cat 4 products). Tonka bean absolute is also subject to constituent caps because of its high coumarin content. In some jurisdictions (most notably the US, where coumarin is FDA-banned as a food additive since 1954), tonka use in food is forbidden — but fragrance use remains regulated only by IFRA, not by the FDA.

Sources & Notes

[A] PubChem CID 323 — coumarin, CAS 91-64-5, C₉H₆O₂. The defining aroma compound of tonka bean. pubchem.ncbi.nlm.nih.gov/compound/323.

Did You Know?

Did you know?

Coumarin was isolated twice in 1820 by two chemists who did not know about each other's work. A. Vogel in Munich extracted it from tonka beans but mistook it for benzoic acid. Guibourt in Paris independently isolated the same compound, recognized it was something new, and named it coumarine — from coumarou, the Tupi word for the tree. Vogel's error stood uncorrected for years.

Extraction & Chemistry

Extraction method: Tonka absolute: solvent extraction of dried, fermented Dipteryx odorata seeds. After harvest, the beans are soaked in alcohol or rum for 12-24 hours, then dried. Coumarin crystallizes on the surface as a white frost — the crystalline deposit is visible on properly cured beans. The absolute is a dark brown waxy solid, soluble in alcohol, insoluble in water. Synthetic coumarin: Perkin reaction — condensation of salicylaldehyde with acetic anhydride in the presence of sodium acetate, followed by decarboxylation. First achieved by William Henry Perkin in 1868. Product is white crystals, melting point 69-71°C. Synthetic coumarin dominates commercial perfumery due to cost and supply consistency.

↑ See Terroir & Origins for origin-specific methods.

Molecular Formula	C₉H₆O₂ (coumarin, MW 146.14, dominant constituent at 20-45% of absolute)
CAS Number	8046-22-8 (absolute) · 91-64-5 (coumarin)
Botanical Name	Dipteryx odorata
IFRA Status	Coumarin: restricted (max concentration limits). Tonka absolute: restricted.
Synonyms	TONKA · FEVE TONKA · COUMARIN · CUMARU
Physical Properties
Odor Strength	Medium
Lasting Power	400 hours at 100.00%
Appearance	dark brown solid
Flash Point	212.00 °F. TCC ( 100.00 °C. )

In Perfumery

Coumarin is structurally non-negotiable in three fragrance families. In the fougère (lavender + oakmoss + coumarin), it is the third pillar — remove it and the accord collapses. In Amber and amber compositions (vanilla + coumarin + labdanum), it softens balsamic density and bridges the gap between sweet and resinous. In tobacco constructions, it provides the warm hay-like sweetness that reads as cured leaf. Functionally, coumarin acts as a fixative. Its molecular weight (146.14) and low vapor pressure give it substantial tenacity — TGSC records substantivity at 364 hours for pure coumarin, 400 hours for the absolute. It extends the presence of more volatile materials in the heart and top without adding heaviness. Synthetic coumarin (Perkin synthesis, salicylaldehyde + acetic anhydride) dominates at scale. Tonka absolute is used where its additional almond-tobacco complexity matters. Ethyl vanillin and dihydrocoumarin are sometimes employed as flanking molecules to reconstruct the absolute's profile synthetically. In Première Peau's Albatre Sépia (/products/albatre-sepia-white-truffle-ink-perfume), coumarin-range warmth anchors the gourmand base, providing the sweet-dry counterpoint to the truffle and ink accord.