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Old 11-23-2008, 08:16 PM   #11
conpewter's Avatar
Nov 2007
East Dundee, Illinois
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Originally Posted by mysteryberto View Post
I brew outside in the sun often. How come the sun doesn't skunk my beer up?
Riboflavin, a compound produced by yeast during fermentation, absorbs energy from light at wavelengths of 350 to 500 nanometers (nm). It transfers the energy to iso-alpha acids, the compounds that give beer bitterness. They then release free radicals-small, unstable chemical fragments-that react with sulfur compounds produced by the yeast.
Since Riboflavin is made by the yeast and that is the first step in skunking the beer you can't skunk beer until it has started fermentation. So while you are brewing sunlight doesn't matter. You can put it under UV light all you want until it has started fermentation.
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Old 11-23-2008, 09:10 PM   #12
Aug 2006
Delmar NY
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Originally Posted by giligson View Post
.... the thickness of the target (light will be absorbed only near the surface of the carboy and be significantly attenuated within about 1mm).
That's probably the main thing that protects you when you are brewing. Not much surface is exposed in the kettle.

Even so, my carboys are all wearing old t-shirts, just to be safe.
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Old 09-27-2010, 08:30 AM   #13
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Mar 2009
California, Pennsylvania
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I guess I wont throw all those old shirts out now...

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Old 09-27-2010, 09:25 AM   #14
May 2007
San Diego, CA
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Originally Posted by Piotr View Post
Thank you for your input. I didn't expect skunking effect comes so fast, I taught it would be hours, not minutes.
Conclusion - no posiibility of UV sanitation of ready-to-pitch wort. Pity
Originally Posted by mysteryberto View Post
I brew outside in the sun often. How come the sun doesn't skunk my beer up?
Both of you guys read what was posted again...

Skunking is something that happens POST-fermentation. There are compounds that are absent in our wort that is not yet beer. Once you have started to ferment, all bets are off. And yeah, a beer will start to skunk in a matter of seconds. Even in an amber bottle, you don't want to have too much direct sunlight. I've had a bottle of SNPA that was left to the sun for a few hours that was super skunked.

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Old 09-27-2010, 11:16 AM   #15
Feb 2010
Gaithersburg, MD
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I keep my carboys covered with a towel and in the fermentation area I just have 1 25 watt bulb on a pullchain.

No CFL's for me here; they're not dimmable, they contain mercury, which poisons the air if they break (http://www.energystar.gov/ia/product...d_Disposal.pdf), and they are a disposal hazzard (can't just throw them in the trash).

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Old 09-28-2010, 02:43 AM   #16
Jun 2010
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Originally Posted by Brewdouche-RuBrew View Post
I guess I wont throw all those old shirts out now...
Seriousy. Works great, cheap and disposable as well.

Of course, your carboys clothing should be appropriate...

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