Author Topic: Color changing beer  (Read 988 times)

Offline Tofito

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Color changing beer
« on: September 07, 2015, 01:21:27 PM »
Hi,

Last June i brewed a sort of "summer pale" (a bit of wheat and oats, simcoe and summer hops, english yeast) that had great success.
My problem is that now, 3 months later, the beer is realy darker like purple-ized. It only affects some bottles, others are OK, and in the affected bottles the yeast slury is realy purple!

Here are some pictures:

Normal color:


Changed color:

Slury:


It doesn't taste like infected, no acidity at all. It is just a little astringeant and hops flavor and aroma are lower than "normal" bottles.

What do you think may cause that??

Offline dkfick

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Re: Color changing beer
« Reply #1 on: September 07, 2015, 02:12:21 PM »
Oxidation will cause a beer to darken and get more 'dull grey in color'... Not sure what's going on with the purple.
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Offline pete b

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Re: Color changing beer
« Reply #2 on: September 07, 2015, 02:30:56 PM »
Sometimes I think there are people out there who sneak into our houses and do crazy stuff with our beer to mess with us.
Don't let the bastards cheer you up.

Offline BrewBama

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Re: Color changing beer
« Reply #3 on: September 07, 2015, 02:49:35 PM »
Sometimes I think there are people out there who sneak into our houses and do crazy stuff with our beer to mess with us.
Tommyknockers
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Offline Tofito

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Re: Color changing beer
« Reply #4 on: September 07, 2015, 03:11:45 PM »
Hypotheses:

- Oxydation: A pre-botling oxydation would affect all the bottles. The whole batch is bottled the same way, so all bottles would be affected. Post-bottling oxydation??

- Sanitation process failure: I use to wash my bottles directly after pouring, so they are quite clean. Then just before bottling I sanitize the bottles with Chemipro Oxi (sodium percarbonate) and have never had any problem with it. Admitting some bottles have been unsufficiently sanitized.. what could cause this coloration??

- Anything else I could suspect?

Offline reverseapachemaster

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Re: Color changing beer
« Reply #5 on: September 07, 2015, 03:27:21 PM »
I had that happen to exactly one bottle in one batch four or five years ago. All beers were a nice blonde color and then I opened one and it was straight pink. People I've told this to insisted somebody added food coloring to the bottle when I wasn't looking but nobody else was in the house when I bottled and I opened the bottle myself.

No idea how this happened.
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Offline brewinhard

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Re: Color changing beer
« Reply #6 on: September 07, 2015, 07:04:55 PM »
I had that happen to exactly one bottle in one batch four or five years ago. All beers were a nice blonde color and then I opened one and it was straight pink. People I've told this to insisted somebody added food coloring to the bottle when I wasn't looking but nobody else was in the house when I bottled and I opened the bottle myself.

No idea how this happened.

Uhhhh....Yeah, sure...we believe you.... ::)

Offline Stevie

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Re: Color changing beer
« Reply #7 on: September 07, 2015, 09:47:25 PM »
I wonder if it's the caps. Maybe the lacquer or rubber seal wasn't sufficient and it caused some sort of tarnishing.

Offline Tofito

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Re: Color changing beer
« Reply #8 on: September 07, 2015, 09:53:37 PM »
I suspected the caps too, but same caps pack for a previous batch didn't make any color problem...

Offline Slowbrew

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Re: Color changing beer
« Reply #9 on: September 07, 2015, 10:19:25 PM »
Sun spots?

Goonies?

Moogwa?

Seriously, I have no clue.  I can tell you it wasn't the Greys.  I asked and they swear they were never in your house.  They did say the cookies were good.

 ;D ;D

Paul
Where the heck are we going?  And what's with this hand basket?