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Ambergris

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Ambergris (Ambra grisea, Ambre gris, ambergrease, or grey amber) is a solid, waxy, flammable substance of a dull grey or blackish color, with the shades being variegated like marble. It possesses a peculiar sweet, earthy odour not unlike isopropyl alcohol. Now largely replaced by synthetics, it is occasionally still used as a fixative in perfumery.

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Ambergris occurs as a biliary concretion in the intestines of the sperm whale, and can be found floating upon the sea, on the sea-coast, or in the sand near the sea-coast. Because lumps of ambergris with embedded beaks of giant squid have been found, scientists have theorized that the whale's intestine produces the substance as a means of facilitating the passage of hard, sharp objects that the whale might have inadvertently eaten. Ambergris can be found in the Atlantic Ocean; on the coasts of Brazil and Madagascar; also on the coast of Africa, of the East Indies, China, Japan, Australia, New Zealand and the Molucca islands. However, most commercially collected ambergris came from the Bahama Islands, Providence Island, etc. It is also sometimes found in the abdomens of whales.

Physical properties

Ambergris is found in lumps of various shapes and sizes, weighing from ½ oz (14 g) to 100 or more pounds (45 or more kg). When initially expelled by the whale or removed from it, the fatty precursor of ambergris is pale white in colour (sometimes streaked with black), soft in consistency, with a strong fecal smell. Following months to years of photo-degradation and oxidation in the ocean, this precursor gradually hardens, developing a dark grey or black colour, a crusty and waxy texture, and a peculiar odour that is at once sweet, earthy, marine, and animalic. Its smell has been described by many as a vastly richer and smoother version of isopropanol without its stinging harshness.

In this developed condition, ambergris has a specific gravity ranging from 0.780 to 0.926. It melts at about 62 °C to a fatty, yellow resinous-like liquid; and at 100 °C it is volatilized into a white vapour. It is soluble in ether, and in volatile and fixed oils. Ambergris is relatively unreactive to acid. White crystals of a substance called ambrein, which closely resembles cholesterol, can be separated from ambergris by heating raw ambergris in alcohol then allowing the resulting solution to cool.

Replacement compounds and economics

Historically, the primary commercial use of ambergris has been in fragrance chemistry, although it has also been used for medicinal and flavoring purposes. Ambergris is one of the most important amber type odorants and is highly sought. However, it is difficult to get a consistent and reliable supply of high quality ambergris. Due to demand for ambergris and its high price, replacement compounds have been sought out by the fragrance industry and chemically synthesized. The most important of these is Ambrox, which has taken its place as the most widely used amber odorant in perfume manufacture. The oldest and most commercially significant synthesis of Ambrox is from sclareol (primarily extracted from Clary sage), although syntheses have been devised from a variety of other natural products, including cis-abienol and thujone. Procedures for the microbial production of Ambrox have also been devised.

Depending on its quality, raw ambergris fetches approximately USD$20 per gram. In the United States, possession of any part of an endangered species — including ambergris that has washed ashore — is a violation of the Endangered Species Act of 1978.

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