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Old 10-01-2009, 01:36 PM   #1
Mantis
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Default Oil Slick in beer

So i'm curious about this oil slick thing in my beer. Everything went fine throughout the whole process. This was my first attempt at a partial mash and I did deathbrewers Franziskaner Dunkel clone. The mash went good except for some minor temp changes, give or take 3 degrees ( I also used his apartment partial mash method, mashing in a kettle on the stove). Fermentation was normal as well. Nothing out of the ordinary. So I bottled and it's ready to drink now. Taste is great! But every one i've poured so far has had this small oil slick on the top of the beer after the head goes away. It's bugging me. Any ideas?


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Old 10-01-2009, 01:40 PM   #2
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Did you clean all your equip with hot water and soap before sterilization, sometimes I get stuck with the same problem, maybe also your glassware?


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Old 10-01-2009, 01:46 PM   #3
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The glassware was pulled directly from the cabinet with nothing done to it before pouring the beer. Our glasses are washed in the dishwasher, then thrown in the cabinet. Maybe thats it. I usually don't use soap when i'm cleaning my brewing equipment before brewing. Just hot water and sanitizer. The bottles were washed in the dishwasher w/ detergent (wasn't thinking) on sanitize mode. Now that I think about it, that could be problem right there, the detergent in the dishwasher.
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Old 10-01-2009, 03:20 PM   #4
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Quote:
Originally Posted by Mantis View Post
Now that I think about it, that could be problem right there, the detergent in the dishwasher.
That would be my guess. Sounds like you have soap on something, either the glass or the bottles.
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Old 10-01-2009, 03:21 PM   #5
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that is probably exactly your problem. A lot of dishwashers tend to leave a small amount of residue, and while it generally goes unnoticed, it can really screw with your (beer's) head.
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Old 10-01-2009, 03:24 PM   #6
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detergent would affect head retention. at least if you clean the bottles with it, not sure about the glasses. how did you aerate your wart?
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Old 10-01-2009, 03:35 PM   #7
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how did you aerate your wart?
Put a stopper on the carboy and shook it up to the best of my abillity. More like a vigorous jostling actually.
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Old 10-01-2009, 03:46 PM   #8
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ok thats good. i've heard of people using vegetable oil to aerate their wart. this would be a rather obvious source of an oil slick on your beer.

you could use a fish take aerator and air-stone with an inline air filter to aerate your wart. makes the job much easier.

aeration supplies
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Old 10-01-2009, 05:15 PM   #9
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What did you use to sanitze your equipment? I hear that some commercial sanitizers (like Starsan) can leave an oil slick on the top of your beer.
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Old 10-01-2009, 07:20 PM   #10
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I use one step to sanitize. I know it gets mixed reviews, but it's cheap and I've never had any infection issues.


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