Many beers come in brown glass bottles and sometimes green. But why? The answer has something to do with “skunking” – when beer produces a similar chemical compound to that of skunks. Here ...

When hops in beer are exposed to strong light, a photooxidation reaction takes place, creating the compound 3-methyl-2-butene-1-thiol. To prevent the process of skunking from occurring, beer ...

You've probably noticed the glass bottles used for beer are often brown or green glass. That's thanks to a chemical reaction no beer lover likes: skunking.