Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Fermenting in carboy and sunlight?
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Old 12-02-2011, 04:33 PM   #1
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Default Fermenting in carboy and sunlight?

This may sound silly but was just wonder if it is necessary to cover your carboys to limit sunlight exposure during fermentation? I have done this for years, what does everyone else do?


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Old 12-02-2011, 04:35 PM   #2
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Covered or in a dark closet. If it gets light struck, it'll get skunky like Corona.


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Old 12-02-2011, 04:36 PM   #3
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You really should cover your carboys if they're going to be hit by the sun. Sun + the hops in fermented beer = Heiniken.... (Skunk)
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Old 12-02-2011, 04:38 PM   #4
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I always cover mine with a dark tee shirt. When it gets cold,like this time of year,I place an old fleece lined CPO over that. Def helps stabilize temps fairly well.
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Old 12-02-2011, 04:41 PM   #5
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Does anyone have experience with skunking during active fermentation?
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Old 12-02-2011, 06:43 PM   #6
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Google search "Beer and Sunlight"
first hit:

Enemy #1 – Sunlight!

Beer has several natural enemies. The first is light, especially direct sunlight. Nothing will get a beer to go bad faster than days of direct sunlight. This is reason that most beer bottles are dark brown color. Although the clear Corona bottles show off the beautiful yellow color of the beer, the bright Mexican sunlight can get in and turn the beer against you.

The hops flowers used to give beer its flavor are extremely sensitive to the ultra-violet radiation streaming from the Sun. Even if exposed to sunlight for less than an hour, beer will undergo a chemical reaction that creates an organic compound called 3-methyl crotyl mercaptan. Give that a sip, and you’ll understand why a beer can be called “skunky”.

Most supermarkets use display cases lit by fluorescent light. They’re bright, and cheap to operate, but they blast out the ultraviolet radiation that can set a beer going skunky. If you want to best beer you can buy, look for bottles kept in a dark box, away from the sunlight and fluorescent lights. Cans are safe too.

Brewers can battle this process by using hydrogenated hop extracts instead of fresh hops, but then you’re not getting the best quality beer.
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Old 12-02-2011, 07:09 PM   #7
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I cover my carboy with a sheet, too.

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Old 12-02-2011, 07:11 PM   #8
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Quote:
Originally Posted by JonM View Post
Covered or in a dark closet. If it gets light struck, it'll get skunky like Corona.
Like Corona,, i was thinking more like LandShark.. LOL

he's right on the money
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Old 12-02-2011, 07:28 PM   #9
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Yup. Like my wife told me one evening last summer,after a skunked batch of HB original-thou shalt not buy beer in clear or green bottles. So sayeth SWMBO...
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Old 12-02-2011, 07:33 PM   #10
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You can always do like this guy did, and class up your carboys.



Though concrete geese costumes could be fun as well.





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