The opening.
Top notes describe the first impression. Often bright or volatile, they may include citrus, aromatic or green effects. They do not all disappear at the same moment.
The heart.
Heart notes describe the central character as the opening changes. Florals, spices and many other effects can appear here. A perfume is a continuous composition, not three sealed compartments.
The drydown.
The later impression often emphasises longer-lasting materials such as woods, resins and musks. How long it lasts depends on the complete formula, dose, skin and environment.
A note is not an ingredient list.
"Leather," "sea air" and "amber" can be impressions created by multiple materials. A note pyramid is a storytelling and orientation tool, not a formula or allergen disclosure.
General fragrance education, not medical or product safety advice. Note impressions vary; always follow a finished product's labelling. For fragrance safety standards, see IFRA's safe-use guidance ↗.