Since essential oils are natural compounds they need to be looked after and be stored correctly for them to retain their potency and kept safe. There are certain safety measures to keep in mind with essential oils, and we would suggest that you read the page dealing with them.
When you buy your oils, first make sure that you are buying proper pure essential oils, and not synthetic copies of the real thing, nor diluted or adulterated essential oils.
Synthetic oils may smell almost like the real thing, but will not contain the therapeutic qualities of pure essential oils, and synthetic oils are also one of the major causes or allergic reactions. So when you see a bottle marked as "fragrant oil", "potpourri oil" or any such vague references to essential oils be careful - you are not buying the real thing.
Essential oils should be labeled "pure essential oil" or "100% essential oil" as a bottle labeled "aromatherapy oil" may contain only a fraction of essential oil, blended into a carrier oil.
Never buy essential oils from a company if all the different oils are the same price - essential oils vary greatly in price and it is impossible to sell all of them at the same price.
Packaging 
All essential oils must be packed in colored glass bottles - if they are packed in clear glass the oils could have been spoiled.
Vegetable carrier oils can be packed in clear containers, but pure essential oils are always packed in either amber or blue bottles.
Essential oil bottles must be fitted with a dropper cap to allow drops to be dispensed one drop at a time.
The Latin name of the oil must appear on the bottle as to remove any confusion as to what you are buying, since many variants of oils are available.
Essential oils must be kept in a cool dark place and can also be refrigerated to keep them from spoiling. (But do not freeze)
Some essential oils may cloud when stored at very cool temperatures, but will return to normal at room temperature. There are however some citrus oils that will stay cloudy after being cooled down, but this does not affect their therapeutic properties.
Never leave the cap off a bottle of essential oil for longer than necessary as they are volatile oils.
Most essential oils will keep for a long time, but citrus oils should not be used on the skin if more than 6 - 9 months old. They can still be used in fragrance therapy, but may have deteriorated to the point of not being suitable for dermal application.
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