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1. 

   bkbergen Zealot (639) Jan 5, 2009 Pennsylvania

   Trader

   https://www.instagram.com/p/B6cMtysDx1S/?igshid=gkngxz8cl7xuThis is a Mad Elf 2016 bottle cap that I just opened. The bottles have been in a basement since I bought the 12 pack in 2016. Would these bubbles effect the taste of the beer? What causes this to happen to the bottle cap?
   
   

    

   #1 bkbergen, Dec 24, 2019

   unlikelyspiderperson likes this.
2. 

   Beer_Economicus Pooh-Bah (2,698) Apr 8, 2017 Ohio

   Pooh-Bah Trader

   That looks to be a variant of the “oxygen absorbing” cap variety. I do not know what cusses the bubbles, but I assume it is a result of the cap doing it’s job - absorbing the oxygen in the bottle so that the beer does not become oxidized.

    

   #2 Beer_Economicus, Dec 24, 2019

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