A structured reference covering the foundational syllabus of practical aromatherapy, from olfactory physiology to studio practice.

Blends are structured around three note classes that differ in how quickly they evaporate and how long they persist.

Highly volatile compounds that register first on the nose and evaporate quickly, shaping the opening of a blend.

Moderately volatile compounds that form the body of a blend and bridge the top and base notes.

Low-volatility compounds that anchor the blend, slow evaporation of the lighter notes, and extend its lasting character.

Environmental diffusion should be run in ventilated rooms at measured intervals, with attention to the scent load in the air. Topical use depends on carrier oil dilution ratios, set to suit the method and the person.

Safe handling guidelines apply across all topical and diffusion methods. Review each protocol before practice and record the ratios and durations used in study notes.