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Old 10-27-2011, 04:43 PM   #1
BarberSurgeon
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I've got a pack of liquid yeast that probably expired a little over a month ago. I'd still like to revive it, but not knowing how much viable yeast remain, I don't want to overwhelm them in a starter that's too large. I normally make about a liter. What do you think is an appropriate size for 4-5 month yeast?
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Old 10-27-2011, 04:52 PM   #2
slykwilli
 
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One of our guys on the forums made this calc, I'd start there. http://yeastcalc.summitwoodwork.com/
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Old 10-27-2011, 05:17 PM   #3
Misplaced_Canuck
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Quote:
Originally Posted by BarberSurgeon View Post
I've got a pack of liquid yeast that probably expired a little over a month ago. I'd still like to revive it, but not knowing how much viable yeast remain, I don't want to overwhelm them in a starter that's too large. I normally make about a liter. What do you think is an appropriate size for 4-5 month yeast?
Make a 1.030 1-Liter starter, ferment out, cold crash, decant, and do the same again.

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Old 10-28-2011, 06:54 PM   #4
BarberSurgeon
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Well, that calculator says I should have 0% viability, but I've heard success stories, so let's give it a shot anyway!
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Old 10-28-2011, 06:56 PM   #5
acuenca
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Quote:
Originally Posted by BarberSurgeon View Post
Well, that calculator says I should have 0% viability, but I've heard success stories, so let's give it a shot anyway!
I doubt you're at zero but you'll more than likely need to do a couple of step up starters as the post above suggested to get your numbers up...

 
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Old 10-31-2011, 09:26 PM   #6
BarberSurgeon
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Starter is going now. Took a while to get going, but one more ought to be enough for a two-gallon batch!
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