Pure Essential Oils are graded from 1 to 10 !

Grades 4 to 10 are considered "commercial grade"
essential oils, even though they can be called pure essential oils.

As each distillation process takes place, it depletes the remaining
essences of the plants which are being distilled.

Commercial grade essential oils, do not contain all of the
properties of essential oils graded 1 - 3.