This was because the clear glass allowed UV rays to penetrate the beer and alter the flavour. The solution was turning bottles brown, a darker colour which would block out the rays. After World ...

Significance of beer bottle colour Beer has been bottled since ... Green bottles: A risky choice During World War II, brown ...

Buying beer in cans helps because sunlight can't pass through the solid aluminum. It can however pass through glass bottles and will begin to chemically alter the brew. Darker-colored brown ...