Definition
Castoreum is a yellowish-brown secretion produced by the castor sacs (a pair of scent glands) located near the base of the tail in both male and female beavers. Historically sourced from Siberia and Canada, the material was processed into a dry granule, tincture, or absolute for use in perfumery. Its olfactive character is complex: leathery, smoky, tobacco-like, slightly medicinal, with a sweet birch-tar note at low concentrations (IFRA ingredient database, accessed 2026-05-27).
The European beaver (Castor fiber) is listed on CITES Appendix III in some range states, and collection of castoreum is strictly regulated. Most contemporary perfumery uses synthetic substitutes or castoreum from farmed Canadian beaver populations.
Technical detail
Castoreum absolute contains a complex mix of phenols, salicylaldehyde, acetophenone, cresols, quinoline derivatives, and resinous compounds. This explains both its animalic-leathery character and its warm, slightly sweet facets. In composition, it functions as a base note with exceptional tenacity, castoreum-like tinctures hold on skin for 24 hours or more.
Modern perfumery largely uses synthetic recreations of the castoreum profile (combinations of cresols, salicylaldehyde, and smoky phenolic molecules) to avoid animal-derived sourcing constraints. Some specialist niche houses maintain access to legal castoreum tincture for ultra-high-end productions (Fragrantica, accessed 2026-05-27).
Examples
- Cuir de Russie (Chanel, 1924, Ernest Beaux): castoreum as the foundational element of a leather and birch tar accord, one of the canonical uses of the material (Basenotes wiki, accessed 2026-05-27).
- Bandit (Robert Piguet, 1944, Germaine Cellier): castoreum in a stark leathery-chypre, illustrating the material at its most confrontational (Now Smell This, accessed 2026-05-27).
- Contemporary niche houses working with animalic accords (Orto Parisi, LM Parfums) reference the castoreum-leather axis but use synthetic reproductions.