Dark, acrid, phenolic -- the smell of roads being paved in summer. Coal tar is industrial smoke condensed to a thick black liquid, carrying naphthalene mothballs and creosote darkness.
Dark, acrid, phenolic. Naphthalene (mothballs), creosote (railway sleepers), carbolic soap. More industrial than birch tar (which retains a natural, smoky-leather quality). The smell is of things made, not things grown. At trace levels, it adds urban grit; at higher doses, it dominates with phenolic harshness.
Evolution over time
Immediately
Immediately
Acrid phenolic sharpness, naphthalene, creosote
After a few hours
After a few hours
Dark industrial warmth, medicinal depth
After a few days
After a few days
Persistent smoky-phenolic trace, tenacious
Grades & Aging
Indicative 2025 wholesale prices.
The Full Story
Coal tar is a viscous black liquid produced by the destructive distillation (coking) of coal at 600-1200C. It contains hundreds of polycyclic aromatic hydrocarbons (PAHs) and phenolic compounds. The characteristic smell comes from naphthalene (mothballs), phenol (carbolic acid), cresols (medicinal), and various pyridine derivatives.
In perfumery, coal tar is a transgressive, industrial note used in dark, urban, and avant-garde compositions. The smell is immediately recognisable: hot asphalt, creosote-treated railway sleepers, old-fashioned antiseptic soap. At trace levels, naphthalene and guaiacol can add a subconscious urban-industrial depth to leather and smoke accords.
Functionally, coal tar works as a dark base-note modifier. It provides industrial grimness and urban character. Many classic leather accords historically incorporated birch tar (a related but distinct material); coal tar takes the concept further into industrial territory.
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The entire synthetic dye industry -- and by extension, modern organic chemistry -- began with coal tar. In 1856, 18-year-old William Henry Perkin accidentally synthesised mauveine (the first synthetic dye) from coal-tar aniline while trying to make quinine. His discovery launched a revolution that would eventually produce most of modern perfumery's synthetic molecules.
Extraction & Chemistry
Extraction method: Coal tar is a by-product of coal coking (destructive distillation at 600-1200C). Fractional distillation of crude coal tar yields various aromatic fractions. For perfumery, individual coal-tar components (naphthalene, guaiacol, cresols) are typically used rather than crude coal tar.
Complex mixture of polycyclic aromatic hydrocarbons
CAS Number
8007-45-2
Botanical Name
N/A — industrial byproduct of coal carbonization
IFRA Status
Restricted. Contains polycyclic aromatic hydrocarbons (PAHs); IFRA and EU heavily restrict use.
Synonyms
coal tar pitch, coal tar oil
Physical Properties
Odor Strength
High
Lasting Power
> 200 hours
Appearance
black syrup-like viscous liquid
In Perfumery
Coal tar is a dark, industrial base-note modifier. Key odorants: naphthalene, phenol, cresols, guaiacol. More industrial than birch tar. At trace levels, adds subconscious urban depth to leather and smoke accords. At higher doses, deliberately transgressive. Works in dark-urban, industrial, leather, and avant-garde compositions.
