Essential oils are powerful botanical substances, so it's important to learn proper methods for essential oil storage.
Essential oil manufacturers recommend that all essential oils be stored in dark glass, aluminum or PET plastic bottles.
There are two main reasons for this:
They are light sensitive. Light causes most essential oils to degrade, losing their aroma and therapeutic properties over time.
It's okay to store aromatherapy recipes in clear glass or PET plastic jars or bottles if you'll be using the product within a few weeks.
Essential oils are mild solvents - they eat most plastics. This can cause toxins to be released into your aromatherapy recipe. Not good!
PET plastic is the only plastic not destroyed by essential oils. Undiluted essential oils really need the protection of dark glass, but aromatherapy recipes can happily live in amber, cobalt or green PET plastic bottles and jars.
One final point: It's really not a good idea to store aromatherapy products in the bathroom - it's too warm and humid in there. Undiluted essential oils in particular need to be kept in a cool, dry place. I store a lot of my aromatherapy recipes in the fridge, especially my massage and bath oils.
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