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Old 07-27-2010, 12:28 AM   #1
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Default Bottle Harvest Yeast Quick Question

I have read many times that you can use sanitized foil to make a seal or airlock for a a flask or mason jar in which you are harvesting yeast from a commercial brew.

I was just wondering how you want to arrange the foil? Do you want to get it as airtight as possible and assume that air will get out of it anyway?

I am just confused on how to actually use the foil


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Old 07-27-2010, 12:37 AM   #2
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I tried to figure out how Revvy did his in http://www.homebrewtalk.com/f12/pacm...5/#post1617242 but couldnt quite figure it out


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Old 07-27-2010, 12:45 AM   #3
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The point of the foil is to keep fruitflies and other critters out. You can just crimp it along the edges, so that it's closed.
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Old 07-27-2010, 03:09 AM   #4
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Also, the foil doesn't create an air tight seal. You want oxygen in the bottle so the yeast can grow. Another reason to give it a swirl every once in a while; to encourage more oxygen in the starter wort.
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Old 07-27-2010, 03:14 AM   #5
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Thanks a ton both of you!

That is exactly what I thought but I wasnt sure


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