First things first. Essential oils should be packaged in dark coloured glass, since this filters out the suns ultra-violet light. Until quite recently, dark amber was always the colour of choice in glass bottles as can be seen from old-style medicine bottles. Today, dark shades of blue, green and violet have become more popular and they all offer some protection to your oils.

 

However, no matter what the colour of bottle is, you should never leave oils in a place where the sun will shine directly on them – like on a window shelf in the bathroom, for example. Over a period of months this will dramatically speed up the process of oxidation (deterioration) due to them continually heating up and cooling down. Choose a cool, dark place to keep them safely away from heat and also inquisitive children.