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Old 02-13-2008, 08:02 PM   #1
oooFishy
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Default Purple beer, purple gunk

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, 08:22 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, 08:37 PM   #3
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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, 08:59 PM   #4
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If you put fruit juice in starsan water it turns purple...

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