Essential oils basically start to evaporate as soon as they’re exposed to open air. As they begin to evaporate, they release those beautiful aromas we know (and love) essential oils for. In fact, one way to tell if an essential oil is completely pure, is just to open it.
Because 100% pure essential oils immediately start to evaporate, they’ll release a strong fragrance—right when you open the bottle. Granted, essential oils don’t evaporate very quickly. Rest assured, leaving a bottle open for a minute or two isn’t likely to make a big difference. However, an open bottle of pure essential oil will dissipate much faster than a closed one will.
That’s why we always recommend making sure to tightly close all Ten Leaves essential oils after you’re done using them.