This piece of writing explains many things about storage of essential oils. It tells about the shelf life of essential oils and tips for storing essential oil.
Smaller bottles for storing are preferred since they expose the oil to lesser amounts of oxygen. The bottles should be kept tightly shut and should be opened only as and when required and for very short intervals.
Least possible physical contact with the oil, top of the orifice reducer or the inside of the cap should be done to avoid contamination of the oil. Separate pipette should be used for transferring each oil. A solution to storing these pipettes, used by some people, is the use of small individual plastic bags, labeled for each oil. This is a short-term solution since the oil in the pipette is exposed to oxygen in the bag and deteriorates quickly. By using this pipette again, you risk contaminating your entire bottle.