It's very important how you store your essential oils. Here are some basics:
No heat
No moisture - keep away from shower, etc.
No sunlight - bleaches EO's
No contact with oxygen. In other words, don't leave the top off. Oxidation can especially affect citrus oils, making them more irritating to the skin.
You can refrigerate your oils, or even freeze them. They may crystallize, but will reliquify. Good way to check for impurities; they will sink to the bottom.
How storage affects certain types of EO's:
EO's with Esters in them will separate in the presence of water (like Lavender) and become more acidic.
EO's with Aldehydes in them will detiorate over time (like Lemongrass).
EO's with Alcohols in them are very stable (like Geranium) and won't separate or detiorate as quickly.
EO's with Resinification (like Peppermint) get thicker over time.
Some EO's get better with age (like Ylang Ylang and Patchouli).
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