What percentage of light do green bottles block?

Green bottles are designed to block approximately 20% of light, primarily to protect the contents of the bottle, especially from ultraviolet (UV) light which can degrade certain beverages, such as beer. This level of protection helps to maintain the quality and stability of the beverage inside.

The specific absorbance of the green glass is a balance between maintaining visibility for consumers and ensuring that the product within is shielded from light that could lead to unwanted chemical reactions. This characteristic makes green glass a popular choice for packaging beverages, particularly in the brewing industry, where light exposure can lead to off-flavors in bottled beer.

Unlike darker bottles, which block more light and provide greater protection against light-induced spoilage, green bottles offer a moderate level of protection suitable for many beverages.