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Old 10-02-2012, 09:25 PM   #1
Join Date: Sep 2012
Location: Somerville, Massachusetts
Posts: 5


So I'm brewing an Imperial IPA. I was wicked strict about sanitation (I'm a microbiologist), using StarSan religiously on EVERYTHING. The recipe:

19.6 lbs of Malt Extract, + DME, and 1 extra lb of dextrose

2 oz Warrior hops at the beginning of boil (90 minute)
1 oz Warrior hops at 60 minutes
1 oz Simcoe hops at 45 minutes
1 oz Falconer's Flight at 30 minutes
3/4 tsp Irish moss at the 15 minute mark
1 lb of Dextrose at the 10 minute mark
1 oz of Falconer's Flight & 1 oz of Simcoe hops at the remaining 5 minutes.

pitched 2 packets of US-05 ale yeast, and hopefully ferment between 67F and 74F. First two days were at 80F, I simply couldn't control the ferocious fermentation released energy that was going on.

Now I check it around 13 days later, and this is what I see. It smells good though, and no weird film, just these orange circles floating on the top. Is this bacteria? I can't tell if its hops or not.

I have a pretty good nose for bacteria and mold, I've worked with a ton of it. These patterns of small colonies strike me as potential contamination though, however the orange definitely would scream mold to me if it was between bacteria or mold.

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Old 10-02-2012, 09:27 PM   #2
Join Date: Feb 2012
Location: San Diego, Ca
Posts: 340
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Looks to me just like left over krausen, give it some more time

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Old 10-02-2012, 09:29 PM   #3
Join Date: Jul 2012
Location: Grand Rapids, Michigan
Posts: 889
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Looks like yeast rafts! I use US-05 all the time and I usually get that a little on the top layer of beer but more frequently it gets built up on the top edges of the carboy from when it was producing a large krausen and then settled down and dried.

I wouldn't worry.

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Old 10-02-2012, 09:30 PM   #4
Join Date: Sep 2012
Location: Somerville, Massachusetts
Posts: 5

Phew. Thank you. I wasn't too worried because it smells GREAT. It is still fermenting quite a bit, so I will rest easy and let it do what its going to do.

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