How to Tell if Essential Oil has Gone Bad?

Essential Oil

How to know if your essential oil has gone bad this question may be on your mind if you use essential oil. Here are a few indicators that your oil may be past its prime. Since essential oils dislike direct sunlight, their black bottles are made to keep them from oxidizing. Every three years, you should change your essential oils. Sandalwood and patchouli are a couple of the few exceptions to this rule.