Fecal at full strength, floral at extreme dilution. Skatole is the Jekyll-and-Hyde molecule of perfumery — the same compound that makes jasmine absolute smell alive.
At concentration: unmistakably fecal, barnyard, mothball-adjacent. At extreme dilution: sweet, warm, floral with a creamy, almost narcissus-like quality. The transition is abrupt — there is no gradual spectrum. Skatole is either repulsive or beautiful depending entirely on dosage. Shares the indolic territory with jasmine absolute and orange blossom.
Evolution over time
Immediately
Immediately
Sharp indolic punch (at any perceptible dosage), fecal-floral ambiguity
After a few hours
After a few hours
Warmer, sweeter, the floral side emerges as concentration drops on skin
After a few days
After a few days
Faint sweet warmth, almost vanillic, the animalic edge fully resolved
The Full Story
Skatole (3-methylindole, CAS 83-34-1) is one of perfumery's most polarizing materials. At concentrations above 0.1%, it smells unmistakably fecal — it is, in fact, one of the primary odorants in mammalian feces, produced by bacterial degradation of tryptophan in the gut. At extreme dilution (below 0.01%), it becomes sweet, warm, and floral.
This contrast is not metaphorical. Jasmine absolute naturally contains 2-3% skatole, which contributes to the indolic, animalic richness that distinguishes natural jasmine from its synthetic reconstructions. Without skatole, jasmine would smell clean and pretty but never alive.
Molecular weight: 131.17 g/mol. Melting point: 95°C. The compound is a white crystalline solid at room temperature with a characteristic mother-of-pearl lustre. It is biosynthesized in nature by anaerobic bacteria and also occurs in coal tar.
In perfumery, skatole is used at micro-dosages as an animalic modifier — it provides body, warmth, and a subconscious signal of biological presence. The line between alluring and repulsive is measured in decimal points of concentration.
This note in Première Peau. Doppel Dänçers · Albâtre Sépia. Sample all seven extraits in the Discovery Set.
Skatole is responsible for boar taint — the unpleasant smell of pork from uncastrated male pigs. The compound accumulates in fat tissue, and its detection threshold in pork is just 0.20-0.25 ppm.
Extraction & Chemistry
Extraction method: Commercially synthesized via Fischer indole synthesis or from coal tar fractionation. Natural skatole occurs in jasmine absolute (2-3%), civet paste, and coal tar but is not isolated from these sources for perfumery. Synthetic production from o-toluidine and chloroacetaldehyde is the standard industrial route. CAS 83-34-1.
Molecular Formula
C9H9N
CAS Number
83-34-1
Botanical Name
N/A - synthetic molecule
IFRA Status
No known restrictions
Synonyms
3-METHYLINDOLE · INDOLE-3-METHYL
Physical Properties
Odor Strength
Very High
Lasting Power
400 hours at 1.00%
Appearance
white to tan powder
Boiling Point
265.00 to 266.00 °C. @ 755.00 mm Hg
Flash Point
269.00 °F. TCC ( 131.67 °C. )
Melting Point
95.00 to 97.00 °C. @ 760.00 mm Hg
In Perfumery
Skatole (3-methylindole) is an animalic modifier used at micro-dosages, typically 0.001-0.01% of formula. It provides biological warmth and indolic depth to white floral compositions — particularly jasmine, tuberose, and orange blossom accords. Essential for creating naturalistic white floral reconstructions. Without skatole or indole, jasmine accords lack the living, slightly dirty quality of the natural absolute. Also used in animalic bases and civet reconstructions. Dosage control is critical: too much and the composition becomes unwearable.
