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Old 08-21-2007, 09:06 PM   #11
AiredAle
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CO2 is an acid gas, which is why it burns your nose. It is also not quite odorless, but has an acrid sorta smell. Don't overdo it, don't want you pitching headfirst into the freezer and knocking over the fermenters.



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Old 08-21-2007, 10:24 PM   #12
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Originally Posted by AiredAle
CO2 is an acid gas, which is why it burns your nose. It is also not quite odorless, but has an acrid sorta smell. Don't overdo it, don't want you pitching headfirst into the freezer and knocking over the fermenters.
You're right in stating that CO2 is an acid gas (it's better to consider it an acidic gas, but technically by itself it is an acid gas), but it is also a tasteless, odorless, colorless gas. Ever smell dry ice? I have and it didn't burn my nose. There is some other fermentation by-product giving it that bite and I was just curious if anyone knew.


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Old 08-22-2007, 01:24 AM   #13
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Originally Posted by boo boo
Yeah, me too. I do a rest anyway. Don't hurt.
I've been brewing for about a year. I've done four all grain recipes and three turned out very nicely but I tried a Kolsch that failed miserably. I noticed that smell when I recked it to my secondary and the finished product has a very pungent odor. What is the rest for and do you think it would have saved the batch?
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Old 08-22-2007, 01:42 AM   #14
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Originally Posted by Top Shelf Bob
I noticed that smell when I recked it to my secondary and the finished product has a very pungent odor. What is the rest for and do you think it would have saved the batch?
The rest is a diacetyl rest normally associated with lagers since diacetyl is not desired. In lagers, a couple days at a higher temperature at the end of primary fermentation, allows the yeast to "clean up" the diacetyl in the beer. Check out this article for diacytel rests and low-temp ale fermentation: <http://byo.com/mrwizard/871.html>. Hopefully that answers your question.
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Old 08-22-2007, 11:25 AM   #15
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Originally Posted by menschmaschine
Thanks for the responses everyone. I just thought it had to be more than CO2. CO2 is an odorless gas so why would it burn my nose?
It turns into carbonic acid in your nose. It's a similar chemical reaction to the one that makes you cry when you cut up onions.
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Old 08-22-2007, 11:43 AM   #16
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Originally Posted by thebikingengineer
It turns into carbonic acid in your nose. It's a similar chemical reaction to the one that makes you cry when you cut up onions.
THANK you! That sounds reasonable and like you know what you're talking about.


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