Welcome to BeerAdvocate!

Looking to talk, rate or trade beer? Join today by creating your free account.

Dismiss Notice
Curious about recent updates to the site and app? Check the Announcements forum for updates.
Dismiss Notice
Love Belgian Beer?

Join us Sep 17 in Portland, Maine for Return of the Belgian Beer Fest, featuring hundreds of authentic Belgian beers and Belgian-inspired offerings.

Tickets + more: beeradvocate.com/belgian

Skunked Beer

by: BeerAdvocate on 08-27-2003
“Whoa! This beer is skunked!” is probably something you've heard before, uttered by someone who was probably drinking a green-bottled Heineken. And from the guy who thinks he knows something about beer: “That's because it's in a green bottle, dood.”

Not quite, junior beer guru. That so-called “skunked” character has nothing to do with green bottles, or any color bottles. True, some beer bottle colors are more susceptible to being what's called “light-struck,” however, the whole idea that the color is the [i]cause[/i] is completely wrong.

[b]What does light-struck mean?[/b]
This is when the beer has been exposed to ultraviolet light for a period of time. Hop-derived molecules, called isohumulones, are basically ripped apart. Some of these parts bind with sulfur atoms to create that “skunk” character, which is similar in character to a skunk's natural defense and is such a potent compound that parts-per-trillion can be detected and even ruin a beer. Although brown bottles aid in protecting beer from being light-struck, it hardly makes the beer invincible. Green or clear bottles provide little to no protection. And it's been said that bottled beer can become light-struck in less than one minute in bright sun, after a few hours in diffuse daylight, and in a few days under normal fluorescent lighting.

This light-struck condition is often to blame for a skunked beer. Many popular imports are distributed in green bottles. Pair the two, mix with misinformation and an inexperienced palate, and the common belief becomes that if beer is in a green bottle, it has to be skunked.

[b]Yeah, but everything I drink from (a green bottled, imported beer) tastes skunked.[/b]
Well, it's not like there's an international conspiracy by the brewery to expose all of its beer to being light-struck before being sold. Breweries are not in the business to sell spoiled beer. And did you ever consider that that's the how the beer was intended to smell and taste? The natural and often times wanted sulfur character produced by certain strains of lager yeast, under certain beer style brewing conditions, does not make a skunked beer. Nor does a pungent hop character that you might not be used to. Don't confuse these characteristics with being skunked, as it's not always the case.

[b]Yeah, but it's always skunky in the bottle and not the keg.[/b]
Drinking from the bottle is a more concentrated experience. Drinking from a glass allows the beer's characters to become more volatile, thus a less concentrated experience. It doesn't necessarily mean that the beer in the bottle is skunked.

[b]How can I avoid skunked beers?[/b]
Simple. Don't buy beer on display, don't buy beer in a cooler that is brightly lit and don't leave your beer exposed to light.

So there you have it. Just remember that before you give up on a beer and write it off as being skunked, keep in mind that there's a lot more that could be going on, and that perception of characters is highly subjective. What you might call skunked due to lack of knowledge could be a tasty German-style Pils to another.

Respect beer.
© BeerAdvocate.com, Inc. All rights reserved.
  • About Us

    Your go-to website for beer (since 1996), publishers of BeerAdvocate magazine (since 2006) and hosts of world-class beer events (since 2003). Respect Beer.
  • Return of the Belgian Beer Fest

    BeerAdvocate Brings its All-Belgian Fest to Portland, Maine on September 17, 2016. Tickets are on sale now.

    Learn More
  • Get the Mag

    Become a BeerAdvocate magazine print subscriber today.

    Subscribe