How quickly can beer develop a skunk flavor when exposed to light?

Beer can develop a skunk flavor, often referred to as "lightstruck," when it is exposed to ultraviolet (UV) light. The correct answer, indicating that this can occur in less than a minute, highlights the sensitivity of certain beers, particularly those in clear or green bottles, to light exposure.

When light interacts with the hops in beer, it can cause chemical reactions that produce 3-methyl-2-butene-1-thiol, a compound that contributes to the skunky aroma. This reaction can happen extremely quickly, underscoring the importance of proper storage for beer to preserve its intended flavors. For this reason, beers are often packaged in darker bottles or cans that better protect them from light.

It's also noteworthy that while some beers may take longer to show off-flavors due to different ingredients or packaging, the rapid onset of skunkiness is a recognized risk, illustrating the need for beer enthusiasts to be mindful of how they handle and store their beverages.