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Extract/Partial Mash Brewing / Re: "Twanginess" aftertaste to my Pale Ale
« on: March 22, 2013, 08:41:37 AM »
I wouldn't immediately assume infection, based on the information given, unless the bottles are getting worse over time, and not just your dislike for the off flavor but that the off flavor is getting more potent over time.
There are a few possible causes for an off flavor that you're not likely to replicate, such as stale ingredients in an old and poorly treated extract kit, but I would look at what possible causes you can control and should improve even if they are not the direct causes of the off flavor here. Like other people here, I strongly suspect the off flavor is a product of fermentation.
You used liquid yeast but didn't mention whether you made a starter. You could probably get away on this beer without a starter but if the yeast was a little past its prime or struggled to get moving you could have some off flavors from stressed yeast that could have been avoided with a starter.
The temperature is the likely culprit with that yeast. For these cleaner strains you really want to keep it down in the 60s for the first several days until the majority of fermentation is complete. If you have the space, money and willingness to commit to it, a fridge and temp controller is your best bet to control fermentation temperatures. If you're not ready to sock the extra money into brewing or lack the space for the fridge, you can also reasonably regulate temperatures using the tub of water/ice method. You won't be able to dial in a temperature and control it there all day every day but it's a good starting place to keep you out of the weeds.
There are a few possible causes for an off flavor that you're not likely to replicate, such as stale ingredients in an old and poorly treated extract kit, but I would look at what possible causes you can control and should improve even if they are not the direct causes of the off flavor here. Like other people here, I strongly suspect the off flavor is a product of fermentation.
You used liquid yeast but didn't mention whether you made a starter. You could probably get away on this beer without a starter but if the yeast was a little past its prime or struggled to get moving you could have some off flavors from stressed yeast that could have been avoided with a starter.
The temperature is the likely culprit with that yeast. For these cleaner strains you really want to keep it down in the 60s for the first several days until the majority of fermentation is complete. If you have the space, money and willingness to commit to it, a fridge and temp controller is your best bet to control fermentation temperatures. If you're not ready to sock the extra money into brewing or lack the space for the fridge, you can also reasonably regulate temperatures using the tub of water/ice method. You won't be able to dial in a temperature and control it there all day every day but it's a good starting place to keep you out of the weeds.

