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Old 09-20-2013, 11:03 AM   #1
Jman_01
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Default starter FG

Its going on 2 days on my starter and krausen is falling back in. I would like to know what should be the FG for it? Never made a srarter so im new to this. The OG was 1.035-1.040 ish. Just trying yo get an idea how long it'll be. I want to cold crash it when ready. Thanks

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Old 09-20-2013, 12:10 PM   #2
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If you allow the starter to finish the yeast will build up glycogen reserves which will help them ferment the beer. If you crash it now you will have 90% of your cell count. It all depends on how much time you have. You could let it wait for a week with no I'll effect. Assuming 100 billion cells in a 1 or 2 litter starter 3 or 4 days is pretty much ideal.

Like with beer a stable final gravity would indicate that 100% of the cell count / fermentation has been achieved.

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Old 09-20-2013, 07:36 PM   #3
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I plan on letting it finish. I just dont know what a good FG is for it.

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Old 09-20-2013, 07:51 PM   #4
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The final gravity will depend on several factors. In addition to original gravity it depends on the yeast strain, pitch rate, temperature and sugar make up of the malt extract.

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Old 09-20-2013, 09:26 PM   #5
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Good point. I will take a sample and check gravity and see it changes the following day. However its a 3 liter starter, 10.6oz extra light dme with wyeast 1272 london ale yeast fermenting at 67°

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Old 09-20-2013, 09:44 PM   #6
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Wyeast 1272 says attenuation of 72-76%, to give a rough idea of about what you'd expect for FG. Wyeast seems to call 1272 "American Ale II" though, not London Ale??

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Old 09-20-2013, 09:47 PM   #7
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Quote:
Originally Posted by whoaru99 View Post
Wyeast 1272 says attenuation of 72-76%, to give a rough idea of about what you'd expect for FG. Wyeast seems to call 1272 "American Ale II" though, not London Ale??
My bad you are right!
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Old 09-20-2013, 09:51 PM   #8
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Hows the 72-76% equate to a gravity reading?

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Old 09-20-2013, 10:00 PM   #9
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Quote:
Originally Posted by Jman_01 View Post
Hows the 72-76% equate to a gravity reading?
(Og - fg)/(og - 1) = apparent attenuation
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Old 09-20-2013, 10:02 PM   #10
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Thanks thats good to know!

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