Base Notes: Base notes are the heaviest, longest-lasting notes in a fragrance, that usually assert themselves after the heart notes have evaporated. Base notes are often present during the middle phase of a perfume, where they provide depth and stability, but once the heart notes have departed they take on a character of their own, a phase often called the dry down. Common base notes include woods, moss, amber, and musk
The scent of a perfume that appears close to the departure of the middle notes. The base and middle notes together are the main theme of a perfume. Base notes bring depth and solidity to a perfume. Compounds of this class are often the fixatives used to hold and boost the strength of the lighter top and middle notes. Consisting large, heavy molecules that evaporate slowly, compounds of this class of scents are typically rich and “deep” and are usually not perceived until 30 minutes after the application of the perfume or during the period of perfume dry-down.
Some base notes can still be detectable in excess of twenty-four hours after application, particularly the animalic and musk notes.