What is ambergris?

Ambergris, ambergrease, or grey amber, is a solid, waxy, flammable substance of a dull grey or blackish colour produced in the digestive system of sperm whales. Freshly produced ambergris has a marine, fecal odor. It acquires a sweet, earthy scent as it ages, commonly likened to the fragrance of rubbing alcohol without the vaporous chemical astringency.

Ambergris has been highly valued by perfumers as a fixative that allows the scent to endure much longer, although it has been mostly replaced by synthetic ambroxan. Dogs are attracted to the smell of ambergris and are sometimes used by ambergris searchers.

The word ambergris comes from the Old French "ambre gris" or "grey amber". The word "amber" comes from the same source, but it has been applied almost exclusively to fossilized tree resins from the Baltic region since the late 13th century in Europe.

Ambergris is formed from a secretion of the bile duct in the intestines of the sperm whale, and can be found floating on the sea or washed up on coastlines. It is sometimes found in the abdomens of dead sperm whales. Because the beaks of giant squids have been discovered within lumps of ambergris, scientists have theorized that the substance is produced by the whale's gastrointestinal tract to ease the passage of hard, sharp objects that it may have eaten. The sperm whale usually vomits these, but if one travels further down the gut, it will be covered in ambergris.