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Corona is skunky. Heineken is skunky. Why?
The color of their bottles (clear and green).
Well, ultraviolet light cleaves a portion of the iso-alpha acids (source of bitterness in beer, from hops) which eventually leads to the formation of flavor-active sulfur compounds, and skunky flavor. Brown beer bottles protect against this phenomenon.
Why aren't Miller products (MGD and High Life, both clear bottles) skunky?
Well, they use "reduced iso-alpha acids." These have been hydrogenated at a specific location which prevents this cleavage from taking place.
And knowing is half the battle.
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