Cicerone Certified Beer Server Practice Exam

Storing beer away from light helps to prevent which of the following flavors?

1. Butter

2. Paper

3. Skunk

4. Vinegar

The correct answer is: Skunk

Storing beer away from light is crucial for preventing the development of a skunky flavor, which is particularly prevalent in beers packaged in clear or green bottles. This undesirable flavor occurs due to the reaction of certain compounds, primarily riboflavin and iso-alpha acids, with ultraviolet light. When light penetrates the bottle, these compounds can form 3-methyl-2-butene-1-thiol, which is responsible for the characteristic skunky aroma and flavor reminiscent of a skunk spray. To mitigate this risk, beer should ideally be stored in brown bottles or cans, which offer better protection from light. By understanding this relationship between light exposure and skunky flavor development, beer enthusiasts and servers can ensure the quality of the beer they serve and enjoy.