Why do your Extra Virgin Olive Oils come in dark bottles?
It’s a question of quality—dark glass protects the oil from the deteriorating effects of light. This is also why many health products come in brown bottles, wine is bottled in dark green glass, and clear, glass milk bottles have been replaced with opaque cartons.
Even a few weeks of light exposure will accelerate the aging of olive oil. To slow this process, it’s a good idea to store your oil in a dark, cool cabinet instead of on a countertop, which is likely brighter and warmer.