Perfume's 'Grey Gold' Gets a Corporate Map

Givaudan, a Swiss fragrance manufacturer, has identified two human olfactory receptor genes that respond to ambrox, a synthetic molecule used in perfumes from Drakkar Noir to Baccarat Rouge 540. The work puts a scientific map beneath a craft long guided by perfumers’ noses—and gives the industry new clues for designing scents.

Ambrox, also known as ambroxan, reproduces one of the primary aroma molecules in ambergris, the musky substance found in sperm whales. It was first synthetically reproduced in 1950. Parfums Christian Dior says it sells one bottle of its ambrox-laden Sauvage every 30 seconds. A whale-derived scent, translated into a manufactured molecule and sold at industrial scale: perfume’s romance has a production line behind it.

The nose, mapped

In 2025, Andreas Natsch and a team at Givaudan published their findings in Current Biology. They found that one receptor gene’s interaction with ambrox was enough to trigger a woody fragrance sensation; another produced the warm amber scent associated with aged ambergris. The research also identified active relationships between 19 other popular odour molecules, including the rose-like citronellol and geraniol, and corresponding receptors.

The human nose contains roughly 400 olfactory receptors. Odour molecules can bind to them in what scientists call a “lock and key” configuration, sending signals to the brain. Most receptors remain unmapped, or “orphaned” from the scent molecules that activate them. The map is growing, but the route from molecule to brain remains largely unresolved.

“Somehow, we knew that from the perfumer's experience, from the success of those perfumes, and from the usage of those perfumes, that there was something special. But we didn't have the words,” Natsch said. “Now we can explicitly find out why that is the case . . . we can bring together the biology with this deep perfumery knowledge.”

Natsch, a senior research fellow at Givaudan, said predicting which receptors particular molecules activate could help perfumers anticipate how the nose will react to raw materials. “I think we are in the beginning of a revolution of how we understand scent and how we understand these dimensions,” he said. He added that the research could have far-reaching consequences for developing new molecules and help with “molecule design” and distinguishing “different nuances.”

From intuition to ingredient design

For most of human history, perfumers have built compositions intuitively, layering molecules according to their size, weight and volatility. Heavy notes such as ambergris form the base; rich florals make the heart; citrus-like notes, more fleeting and effervescent, rise at the top.

Andy Tauer founded Zurich-based Tauer Perfumes in 2005. Ambrox appears in more than half of the 46 perfumes he has released. In compositions from the 2006 leather fragrance Lonestar Memories to his most recent, the floral green L'Aur du Jardin Caché, Tauer says ambrox can make otherwise fleeting odour molecules last. “It's like a superglue,” he said from his Zurich laboratory. “It makes everything stick together and stay on your skin. And from that point of view, it's very versatile.”

Tauer said more receptor-to-molecule findings could help perfumers predict which receptors a molecule might activate and guide the creation of molecules not yet synthesised. “Increasing the 'noise to signal' [molecule to receptor] ratio will help us to find new molecules,” he said, including possible complements or enhancers for ambroxan.

A scent is more than a signal

The research doesn't settle how molecules send signals to the brain. Perfume critic and biophysicist Luca Turin, who developed a vibration theory of smell in his 2007 book The Secret of Scent, now believes that theory can coexist with the lock-and-key model.

Turin said perfume’s power lies not in science or engineering alone, but in turning nature into an act of communication. “There's a gradient between a smell and a fragrance, in which the amount of human intervention and choice increases as you go from smell to fragrance,” he said. “As you go towards perfume, it really becomes a much more intentional kind of beauty. That is a message from one person to another.”