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Old liquid yeast go sour?

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Horseshoot

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Hello All,

On December 23 of last year, I made my usual American IPA. I call it Big Yellow Dog, in honor of my wonderful 110 pound Golden Retriever, Murphy. It is one I created on Beer Alchemy, and have made several times. It calls for one smack-pack of Wyeast 1272-American Ale II. I didn't notice, until brew day, of course, that my yeast was expired by 6 months. I figured, what the hell. After smacking, and shaking, the package began to expand, as usual.

When it came time to pitch (after an otherwise uneventful brew day... hitting all targets perfectly), I poured the yeast in (after the wort had cooled) and noticed a sour smell. Crap! I smelled the package, and it smelled like vinegar. Naturally I was worried. After 3 days, there was no airlock activity, nor any other signs of fermentation (it was in a 6 gallon carboy, for a five gallon batch, so I could see the wort.) I finally pitched a rehydrated package of Notty. Fermentation took off like crazy the next day.

Today (01-13-13) I racked over to secondary to dry hop. My FG was slightly lower than expected (FG of 1.012 vs expected FG of 1.017). But, OK. The smell was fine. When I tasted the sample, however, I felt I could taste a slight sourness. Not quite Belgian Pale Ale taste. Just faint. Could that be from the bad yeast? Anybody ever experience this?

I am going to dry hop 7 to 10 days, then keg it.

Thanks for your help.

Mike :mug:
 
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Horseshoot

Horseshoot

Well-Known Member
Joined
Dec 14, 2010
Messages
382
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78
Location
Bennington
As it turns out... it was delicious! I kegged it, and took it (in my new kegerator) and it was a hit! They kicked the 5 gallon keg in about 2 hours. (Along with a keg of my American Wheat.)

Mike
 
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