Fresh · Aroma molecule · Top notes
Aldehydes
Aldehydes are a group of scent molecules that smell clean, like soap, candle wax and freshly ironed linen. In perfume the term usually means fatty aldehydes with 8 to 12 carbon atoms, such as C-10, C-11 and C-12. Aldehydes almost always sit in the top notes and give the opening a sparkling lift.
· Written by the FRAG team
What do aldehydes smell like?
Aldehydes smell clean and slightly cool, like a bar of soap, a just-blown-out candle or freshly ironed linen. There is a sparkling, metallic side that makes a perfume's opening feel bright and airy.
Each aldehyde has its own character. C-10 recalls orange peel, C-11 smells waxy and floral, and C-12 is often described as clean laundry. On skin, aldehydes are strongest in the first minutes, then melt into the flowers and musk underneath.
Are aldehydes natural or synthetic?
Aldehydes do occur in nature. Decanal (C-10), for example, is found in citrus peel and coriander oil. Perfume aldehydes, however, are made synthetically so their scent and quality stay consistent. In chemistry, aldehydes are a very large family that even includes vanillin. In perfume, the word aldehydes usually means fatty aldehydes with chains of 8 to 12 carbons.
Perfumers began experimenting with aldehydes around the start of the 20th century. In the 1920s they were used in large doses in floral perfumes, giving rise to the floral-aldehydic style that stayed popular until the 1960s.
What aldehydes do in a perfume
Aldehydes almost always sit in the top notes. They work like a highlighter, making the materials around them brighter and more diffusive, especially the flowers in the heart. In small doses aldehydes add a clean feel. In large doses they become the main signature and smell like sparkling soap foam.
Classic partners are rose, jasmine and iris, with sandalwood and musk in the base. Aldehydes also appear in fresh perfumes with bergamot and other citrus.
When to wear an aldehydic perfume
A perfume with aldehydes feels clean and polished, so it suits work, formal events and daytime. In hot weather the soapy side feels fresh. Aldehydic perfumes heavy with flowers and powder often feel classic, so try one on your skin before buying a full bottle.
