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Somebirs 10-01-2011 02:47 AM

This Blew My Mind
So I brewed a pumpkin ale 13 days ago, and since day 1, there was this thick, frothy, elastic looking foam on the top of the Carboy. It was more than the average kraeusen. Like when you bake bread and the yeast rises.

So it was there. Day after day. I have been keeping everything constant at about 68-70. All of a sudden, today when I came home, the foam is completely gone. 13 days in, and it's done.

Is this a sign active fermentation is done? It wasn't gradual at all. Like a black and white thing. Crazy.

BrewKnurd 10-01-2011 03:07 AM

Its a sign that fermentation is probably slowing down. Only way to know its done is checking gravity.

bottlebomber 10-01-2011 03:27 AM

Sounds like your using a top cropping yeast. And if the recipe uses any wheat, it will contribute further to a dense, spongy cap of krausen on top of the beer. It usually stays there for much longer than your average krausen, then it finally frees and drops into the beer. What yeast strain did you use?

Somebirs 10-01-2011 03:30 AM

This was an Ardennes yeast.

bottlebomber 10-01-2011 03:34 AM


Originally Posted by Somebirs
This was an Ardennes yeast.

Im not familiar with the strain, but many or I might even go as far as to say most belgian strains are top cropping yeasts. What you saw was normal activity for this yeast.

Elshupacabra 10-01-2011 06:01 AM

Sounds just like the Safale US-05 I used in my Pumpkin to me.

Faseel 10-01-2011 10:59 AM

Same thing happened to me. My local brew shop was out of wyeast 1084 so I dug around and found a London ale yeast that was good enough for my sweet stout. Great activity after pitch, by day 4, my average primary for this recipe this thick, foamy statue of bubbles just sat there, like some one threw a whitish brown sponge on top of my beer. I let it sit there for a week and a few days. Finally I just racked it off and have made my fruit addition. At this point im assuming infection but ill see it through and report back. Hearing your story gives me hope for this batch :)

statseeker 10-01-2011 11:06 AM

Dont assume infection. Infection is pretty rare in brews on this forum anyway. We've seen yeast rafts and bubbles and weird pellicles and still they havent turned out to be infected at all. So many people think their beer is infected with something. Of course it is. It's just a yeast infection. You're beer will be fine. Take a deep breath. ;)

Somebirs 10-01-2011 12:27 PM

As for my beer, I don't think there is an infection. It was just a very fluffy foam. Didn't look like an infection to me. And as I said, it went away, so it's all good. Just very interesting.

I had assumed the froth was from the extra protein from the pumpkin. My recipe called for 20 ounces of canned pumpkin, which was part of the steeped grains in a mostly LME brew.

Calder 10-01-2011 04:51 PM

What temp?

I have a batch with WLP550 (Achouffe strain) currently at 9 days with kraeusen still on it.

I usually push this yeast to 75 for a few days and then up to 80+ and kraeusen usually drops in about 5 days. This time I kept it at 70 F as I didn't want too many esters from it. This is the base beer for a Lambic style beer.

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