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Old 02-13-2008, 09:02 PM   #1
oooFishy
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Mar 2006
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A while ago I decided to primary in a couple of 5 gal sanitized + purged cornies. I fitted airlocks for the primary fermentation with a tight wrap of electrical and duct tape to make a seal, and once bubbling subsided I refitted the pressure release valves. Throughout the rest of fermentation I released pressure from the kegs from the valves, either due to continued fermentation or dissolved c02. They sat in the kegs for about a month. I then transferred to purged + sanitized buckets. I noticed the beer had gotten much darker. When I went to carbonate I realized that the beer had turned a winey, purple color. A thick slurry of purple gunk was left behind. I took a sample of the slurry and spun it down in a centrifuge to find a small white pellet among the purple gunk, indicated that the yeast itself was not purple.

I'm assuming I got a contamination from the kegs....It's strange that the exact same thing happened to both of my beers. I'm thinking that by releasing pressure all the time I let nasties get in the beer. It tastes slightly vinegary...

Any ideas?

 
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Old 02-13-2008, 09:22 PM   #2
Guinness71
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Umm - I wanna see a picture of the purple beer!

 
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Old 02-13-2008, 09:37 PM   #3
Germey
 
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in relatively low concentrations, Iodophor will turn proteins purple. Any chance you had some iodophor solution in the kegs?

 
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Old 02-13-2008, 09:59 PM   #4
sirsloop
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If you put fruit juice in starsan water it turns purple...
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Old 12-03-2014, 05:08 AM   #5
TreAdidas
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Mar 2013
Denver, Colorado
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OK I am going to spin this back up because I think the same thing is happening to me.

Situation is I keg a beer and all is going splendidly. Keg carbs up in a week or so (set it and forget it style), beer pours fine we are happy. Then I let the keg sit for a couple of weeks and all of a sudden I go to pull a pint and the beer has gone from the normal golden color one would expect from a primarily 2-row base to some purplish/brownish murky poo water (see pic).

But the plot thickens…. this has happened to me on TWO separate brews. Both on the same keg. And these are the only two beers I have put in this keg as I recently expanded my setup. Further, when I dumped the first batch this happened to, there was a thick goop that coated the keg walls. Sounds very similar to the OP's situation. Is there any reason that a keg would somehow interact with the beer to cause this? Is there some off chance that this keg (which I bought used) was used for some odd purposes in its previous life that would render it useless for beer?

Now before you go asking, I am absolutely crazy about sanitation. I am keeping Five Star in business with all of the PBW and Star San I buy. Further, I also redid all of the o-rings on this keg.

In any case, this keg is going on an indefinite timeout until I can figure this out.

Any ideas?
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Old 12-03-2014, 05:14 AM   #6
Devilsnight
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did you taste it? does it smell wierd?

 
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Old 12-03-2014, 05:23 AM   #7
TreAdidas
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Mar 2013
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Quote:
Originally Posted by Devilsnight View Post
did you taste it? does it smell wierd?
Yes and yes.

Smell = bad fruit, vinegar, bad wine (joint commentary from my wife and I).
Taste = A very off-putting vinegar. Almost medicinal in nature.

FYI - The recipe I brewed is Kelsey McNair's Hop-Fu! as it appeared in Zymurgy a couple of months ago.

 
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Old 12-03-2014, 05:24 AM   #8
OleGoatBrewing
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Have you made any adjustments to your brew session? I was tweaking my mash process and got a cloudy beer which normally is pretty clean.

 
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Old 12-03-2014, 05:28 AM   #9
TreAdidas
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Mar 2013
Denver, Colorado
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Quote:
Originally Posted by OleGoatBrewing View Post
Have you made any adjustments to your brew session? I was tweaking my mash process and got a cloudy beer which normally is pretty clean.
Can't say I have.

What's weird is that everything looks and tastes GREAT until it sits in the keg for a few weeks. Then it all goes to hell.

 
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Old 12-03-2014, 11:55 AM   #10
bja
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Nov 2007
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Look up "Acetobacter Infection".
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I know it just wouldn't be right to kill all the stupid people that we meet, but do you think it would be appropriate to just remove all of the warning labels and let nature take its course?

 
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