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Green apple taste with beer that used bucket with lid with no gasket

I kegged a black porter, from an extract kit 4 days ago, it is still carbonating. It has a green apple taste to it. I let it sit in the primary for 7 weeks, a midwest supplies 6.5 gal bucket w/ a ...
2
votes
3answers
3k views

What is causing a bad flavor after cold conditioning?

I've had something happen to a couple batches and can't figure out what's going on. What happens is a major flavor change after the first two weeks of primary, but for the worse. Normally my beers ...
5
votes
2answers
781 views

Why would aeration cause diacetyl

My BJCP Course states that (too) late aeration can cause diacetyl. My understanding is that diacetyl is produced by yeast during the first phase of fermentation. How could too much oxygen in a ...