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Home Brew Forums > Home Brewing Beer > General Beer Discussion > Green/clear bottles blocking UV light
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Old 06-13-2012, 06:38 PM   #11
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Old 06-13-2012, 06:38 PM   #12
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becks comes in green bottles and its the skunkiest beer i've ever drank. but it also comes in open top 6packs.. stella comes in green bottles but they use a totally inclosed box. they dont even punch out the hand holes, int he factory at least w/e happens after that is not there fault.


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Old 06-13-2012, 06:45 PM   #13
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Referring to Passedpawn's chart, it's the lower wavelength light that skunks a beer correct? Trying to confirm why the brown bottles would offer more protection based on wavelength. Obviously they block more light than a clear or green bottle as well.
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Old 06-13-2012, 06:50 PM   #14
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It's UV light that skunks a beer. That's in the 400nm and below range. From Passedpawn's chart, you can see that brown does a much better job at blocking UV. When you think about it, think of the color light you see passing through a bottle and compare it to this image. Brown is close to red and orange... and not close to blue and UV. The farther the light color is that the bottle lets through from the UV part of the spectrum, the better the bottle will be at keeping your beers tasty. That being said, if you put it in a closed box in a dark place, bottle color makes no difference.
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Old 06-13-2012, 07:09 PM   #15
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I have heard that most transparent glass blocks a lot of UVA and UVB but still allows the visible spectrum to pass through. If glass is thick enough, it can pretty much absorb UV light completely, that's why Corona bottles are thicker (they weigh about 22 grams more than a stander brown bottle). What is also skunking the beer is any blue or high energy light that can get through the glass. If you think about it, when you see a blue bottle what is happening is the glass is absorbing every other wavelength EXCEPT blue and that is what makes it that color. Also, as said before, High Life and others use a modified alpha acid extract that doesn't change into the skunk chemical when exposed to light.
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Old 06-13-2012, 07:15 PM   #16
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Is the "High Life" in "Miller High Life" supposed to mean "long lasting"...
presumably due to their "Hop" method?
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Old 06-13-2012, 07:51 PM   #17
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Quote:
Originally Posted by NA_Wreckdiver View Post
Is the "High Life" in "Miller High Life" supposed to mean "long lasting"...
presumably due to their "Hop" method?
Miller High Life uses a hop extract that contains no isohumulones, so UV light doesn't cause them to turn to thiols, hence no skunk aroma.
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Old 06-13-2012, 08:40 PM   #18
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I got that graph from this white paper. Lots of great info here.

https://www.dropbox.com/s/gcn9joo7zl...brskunking.pdf
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Old 06-13-2012, 09:42 PM   #19
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I use brown 9" longnecks, all commercial throwaways, simply because they're so ubiquitous. That being said, in my situation I wouldn't be afraid to use clear or green. My fermentation is done in plastic buckets, which are going to block light (at least the bad UV part) pretty well. Then the bottles sit in my basement, which is completely dark most of the time. When the bottles are brought out of the basement, they go into the fridge until the beer is consumed....so there's not really a whole lot of exposure to light going on. For people who insist on using green or clear bottles, it could be handled in this way.....
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Old 06-13-2012, 09:44 PM   #20
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Quote:
Originally Posted by solbes View Post
Miller High Life, GrainBelt Premium and some others use hop extracts that do not skunk in sunlight. Maybe the beers the OP is referring to use the same extracts.
i've heard Newcastle employs this same method.


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