Aldehyde C9 is a synthetic ingredient for perfumery and flavoring that has a powerful waxy, fatty, aldehydic, and citrus-like smell. It is also known as Nonanal or Nonyl aldehyde. It is produced commercially by hydroformylation of 1-octene1, and it occurs naturally in several plant oils, such as rose, orange, and geranium. Aldehyde C9 is used to add a natural “flower-wax” or “petal”-like note and a strong “lift” to various fragrance types. It is also used to enhance citrus, dairy, fruit, nut, tea, and meat flavors. Aldehyde C9 is an approved food additive and a safe substance for human consumption. I hope this helps you learn more about Aldehyde C9 aroma.