Ambergris

Ambergris forms in the lower intestine of sperm whales (Physeter macrocephalus) as a fatty cholesterol-rich secretion called ambrein, coating indigestible squid beaks. It is excreted into the ocean as a soft black mass, then floats and cures for years in salt, sun, and microbial action · darkening from black through grey to silver to white over 5-10 years. Cured white ambergris is one of the most prized and expensive natural perfumery materials at £20,000-£40,000 per kilo. The aroma is uniquely complex · sweet, marine, slightly tobacco, slightly animalic, with a luminous warmth that makes other notes shine. Real ambergris remains legal to find, sell, and use in the UK because it is a natural by-product (not hunted) · though banned in the United States since 1972 under the Marine Mammal Protection Act. Most modern fragrances use synthetic alternatives like Ambroxan that recreate the dominant smell at a fraction of the cost. See also our long-form explainer on ambergris in perfumery.