Why are oils in dark bottles?
21 For quality, dark glass protects the contents from the deterioration that light effects. Health products are available in brown bottles, expensive dark green wine bottles and the demise of milk bottles in favour of cartons. A few weeks of light exposure will accelerate the aging of olive oil. The fact that so many olive oils are in clear bottles is certainly a question of marketing. To store your olive oil it is good idea to use a dark, cool cabinet rather than on the bright, warm counter top. This will slow its aging.
