When hops in beer are exposed to strong light, a photooxidation reaction takes place, creating the compound 3-methyl-2-butene-1-thiol. To prevent the process of skunking from occurring, beer brewers have opted for darkly tinted glass. It's why you see so many beers in brown glass bottles today.
"It's a simple reaction that creates what most people see as an undesirable flavor," Skypeck said. "So, anything that shields the beer from that will preserve its flavor, so it is served as the brewer intends."
"If you look to see what brands are in green glass, you're going to probably find mostly heritage brands that have been around for a while," he said. "A fair amount of European brewers use green glass. Their green bottles are their image. And again, we're talking decades ago, there was a certain association of quality and uniqueness with green glass."
When it comes to choosing glass as the packaging material over plastic, Skypeck said not only is glass perceived as more environmentally friendly and looks higher quality to consumers, but it prevents the beer from becoming stale, as plastics let out the carbonation in beer and let in oxygen over time.
As for any other guidance on storing beer to prevent skunking, staling or any changes to the taste, Skypeck has a simple rule: cold and dark.
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