Spraying perfume on a warm wrist can smell bigger but fade faster. Why?

Answer: Heat speeds evaporation

Blood adds new notes — Blood under the wrist does not add rose, amber, or citrus to the formula. Pulse points matter because they are warmer and often exposed to moving air, not because blood contributes a scent accord. Warmth can push more molecules into the air at once, making projection stronger. The price is that the same molecules may be depleted sooner, especially the volatile opening notes.

Heat speeds evaporation ✓ — Right: higher temperature increases molecular motion and vapor pressure, so more fragrance leaves the skin for the air. That can make the perfume feel more radiant in the first hour. But the reservoir on the skin is being spent faster, so the bright part can fade sooner. The practical surprise is that the classic pulse-point trick optimizes noticeability, not necessarily maximum wear time.

Extra alcohol remains — Alcohol can make a spray open quickly, so it is a reasonable suspect. But after application, ethanol is the part designed to dry away rather than sit on the wrist as the lasting engine. The warm-wrist tradeoff is mainly about temperature increasing the escape of volatile fragrance molecules. In short, leftover solvent is less important than faster evaporation from a warmer surface.