Ether from a chemical supplier usually contains an oxidation inhibitor and has a shelf life of two years unopened or one year after the container has been opened. Freshly distilled or uninhibited ether may form peroxides in less than two weeks and must be handled with extreme care. There is no evidence that refrigerated storage will prevent formation of peroxides. Shake for one minute, then let it stand for one minute. Unwrap the flask and view against a white background.
Yellow color indicates the presence of peroxides.
Purchase ether in a quantity that can be used within twelve months. Date the ether to indicate the date received and the date the container was opened. Dispose of ether that is older than one year. Keep ether in a metal can or amber bottle to prevent its exposure to light. Store ether in a well ventilated location.