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Thread: Barrel Aged Stout possible infection?

  1. #1
    Join Date
    Sep 2016
    Location
    NY
    Posts
    16

    Barrel Aged Stout possible infection?

    Hi all
    So I work with bourbon barrels a lot & have never had any issues with infection. I recently switched to a different distillery to try out a new bourbon barrel. The beer is a stout brewed with lactose & strawberry puree. I did age it on cocoa nibs for about 10 days prior to barreling the beer. It has now been in the barrel for about 2 months & I just checked it out to see how its doing when I noticed it has a white film & bubbles on the top layer of beer. I am pretty sure this is some sort of infection but the beer really has not taken any off flavors or aromas as of now. My brite tank is currently full otherwise I would transfer the beer out of the barrel. Any ideas as to what I am dealing with? Possible that the barrel caused this or just relax & drink a beer? LOL
    Thanks
    Last edited by Abrowne0001; 08-31-2019 at 05:36 PM.

  2. #2
    Join Date
    Oct 2002
    Location
    Chesterfield, UK
    Posts
    1,929
    Acetic acid bacteria?? (acetobacter)
    dick

  3. #3
    Join Date
    Sep 2016
    Location
    NY
    Posts
    16
    Quote Originally Posted by dick murton View Post
    Acetic acid bacteria?? (acetobacter)

    That's what I'm thinking but the beer doesn't taste off. Just has the funky layer of slime.

  4. #4
    Join Date
    Oct 2002
    Location
    Chesterfield, UK
    Posts
    1,929
    Could also be some form of wild yeast - forgot that some of these also form a film (pellicle)

    You may get abnormal flavours (possibly acetic acid but depends on yeast type and conditions) and cloudy beer. Often over attenuates.
    dick

  5. #5
    Join Date
    Jan 2018
    Location
    Malden, Massachusetts, USA
    Posts
    2
    Do you have a picture of the pellicle? The source could (possibly) be narrowed down based off the morphology.

    Eddie

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