Using fragrance formats
How to use a perfume oil roller
Use a perfume oil roller only for the intended personal-fragrance application and according to its maker's directions. Oil format does not guarantee low projection, unlimited wear or skin compatibility.
A HUME Fragrance buying guide

Read the actual product
Confirm ready-to-use perfume rather than assuming every scented oil belongs on skin.
Keep direct contact personal
Avoid sharing the roller as a group tester or using it to transfer other materials into the container.
Observe without assuming gentleness
Evaluate the scent separately from ingredient concerns. Stop using an irritating product rather than adding more to test performance.
Try this before you buy
Confirm intended use, ingredient information and application directions before using an unfamiliar oil roller.