What do dark bottles protect beer from?

Dark bottles are primarily used to protect beer from light, particularly ultraviolet (UV) light. When beer is exposed to UV light, it can cause a reaction with the hops in the beer, resulting in an undesirable flavor often referred to as "skunky." This skunky flavor diminishes the overall quality and taste of the beer, making it less enjoyable for the consumer.

By using dark bottles, breweries help mitigate this risk significantly, allowing the beer to maintain its intended flavor profile for a longer period of time. The choice of dark glass material is a strategic packaging decision that plays an essential role in preserving the beer’s quality as it moves from production to consumption.