The heart notes, or middle notes, of a fragrance are the primary notes that define the way a scent is described and categorized. The heart notes generally assert themselves in the first 10 to 20 minutes of wear as the top notes fade, and they make up the strongest impression of the scent. Florals, spices and botanicals are common heart notes.
The scent of a perfume that emerges just prior to when the top notes dissipate. The middle note compounds form the “heart” or main body of a perfume and emerge in the middle of the perfume‘s dispersion process. They serve to mask the often unpleasant initial impression of base notes, which become more pleasant with time. Not surprisingly, the scent of middle note compounds is usually more mellow and “rounded.” Scents from this note class appear anywhere from two minutes to one hour after the application of a perfume.