Application amounts
How much perfume oil should I apply
The appropriate amount of perfume oil depends on the finished product and its dispenser. Follow its personal-use directions rather than applying a universal number of drops or treating raw fragrance material as ready-to-use perfume.
A HUME Fragrance buying guide

Identify the cosmetic
Check intended use and application areas. A home-scent oil, essential oil and finished perfume oil are different products even when their bottles look similar.
Use its dispenser deliberately
A roller, dabber or dropper can deliver different amounts. Start within the maker's directions instead of converting another perfume's sprays into drops.
Keep the first wear separate
Avoid combining several unfamiliar scents while judging the amount. Record enjoyment and presence before deciding how the product fits your routine.
Try this before you buy
Record the stated use and supplied dispenser, then assess the later comfort of a label-directed trial.