Top notes are not the best part of a perfume. They are the fastest part. They exist to create a first impression — and then get out of the way
ACT 01 | 0–60 MIN — Top note compounds: citrus (bergamot, lemon, grapefruit), light herbs (basil, petitgrain), ozonic materials, aldehydes. All high volatility. All designed to evaporate in the first 15 to 60 minutes on skin. Function: create the opening impression, frame the character of the formula, and transition cleanly into Act 2.
ACT 02 | 2–5 HRS — The heart begins to emerge while Act 1 is still present — there is an overlap period. This transition, roughly 30 to 90 minutes in, is when the fragrance begins revealing its true character.
ACT 03 | 6–12 HRS — Base note materials were present in the formula from the start — they are simply too low in volatility to be perceived until the higher-volatility layers have departed. Act 3 is the foundation, not the finale.

WHAT TO DO INSTEAD
When evaluating Act 1, ask: does this opening suit the context in which you will wear it? Does it frame what follows correctly? A clean, citrus Act 1 before a dark, resinous Act 2 creates contrast — a structural decision by the perfumer. A citrus Act 1 before a floral Act 2 creates continuity. Act 1 is not the whole story. It is the introduction. Evaluate it accordingly.