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Old 12-22-2006, 05:19 PM   #1
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Default Picture of Film on Beer

I have been struggling with really low temps while fermenting with start and stop fermentations. Below is a picture of a film that has formed on the top of the wort in the secondary. I transferred a little early from my primary to my secondary (4 days). The beer has been in the secondary for 12 days now and I took a reading 7days ago and got 1.018. Today when I took a reading I got 1.018 again and noticed this film.

I think the film is just a thin, secondary krausen and is yeast (I hope). The beer tasted OK with no sour or off flavors. No taste of residual sweetness. The picture is the best I can do and is not the best I realize. I am a little surprised that what looks to be active if slow fermentation but no drop in my gravity. But I only heat with wood and I'm fighting cold overnight temperatures (dropping to mid 50's).

Yeast is Wyeast 1968. OG was 58. Total time since pitching is
16 days.

Question: Why am I seeing what I think is fermentation but no drop in gravity? Unless that isn't yeast on top (No!....). Guess I'll wait and hope the thang ain't stuck.

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Old 12-22-2006, 05:28 PM   #2
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Not sure about the answer but that looks like a cool pic from the hubble telescope .

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Old 12-22-2006, 06:11 PM   #3
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You seriously need an insulated fermentation box. It is difficult to get a good ferment when the temperature cycles daily.

At 70% attenuation you are at the high limit of what that yeast can be expected to ferment. Rack & bottle.

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Old 12-22-2006, 07:49 PM   #4
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Default Agreed

Agreed David 42. I show that type yeast as attenuating 67-71%. My calculation shows a 69% attenuation. Since no change in gravity in almost a week I'm going to bottle tomorrow.

My current "insulated fermentation box" consists of wrapping towels around the carboy. Not the best method. Any suggestions?

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