Is this an infection? I can't tell - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > General Beer Discussion > Is this an infection? I can't tell

Thread Tools
Old 10-02-2012, 09:25 PM   #1
Sep 2012
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.
Click image for larger version

Name:	Picture 78.jpg
Views:	342
Size:	51.8 KB
ID:	78008   Click image for larger version

Name:	Picture 77.jpg
Views:	648
Size:	66.2 KB
ID:	78009  

Reply With Quote
Old 10-02-2012, 09:27 PM   #2
Feb 2012
San Diego, Ca
Posts: 341
Liked 30 Times on 21 Posts

Looks to me just like left over krausen, give it some more time

Reply With Quote
Old 10-02-2012, 09:29 PM   #3
Jul 2012
Grand Rapids, Michigan
Posts: 888
Liked 84 Times on 77 Posts

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.

Reply With Quote
Old 10-02-2012, 09:30 PM   #4
Sep 2012
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.

Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Infection? BeantownR6 General Beer Discussion 10 10-25-2011 11:01 PM
Might have my first infection. What now? subliminalurge General Beer Discussion 8 10-12-2011 02:50 AM
Infection, but not ben062479 General Beer Discussion 2 09-11-2011 09:38 PM
Infection? deggenbe General Beer Discussion 5 07-06-2011 05:35 PM
My first infection HorribleCatfish General Beer Discussion 13 07-24-2009 10:57 PM

Forum Jump