Perfumes are traditionally structured to contain three levels of “notes”. Known as the top note, the middle note, and the base or bottom note.
The top note is the initial impression a fragrance gives. These fragrances are mild such as cucumber, mint and lemon.
The middle or heart note is the “second” scent, usually warmer and floral. Common examples include tuberose, gardenia, rose.
The bottom or base note of a perfume is the deep earthy aroma that initially is quite subtle, but develops and lingers longer. Familiar base notes include musk, patchouli and sandalwood.