Author Topic: combining old yeasts  (Read 666 times)

Offline rbclay

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combining old yeasts
« on: October 18, 2013, 01:17:21 PM »
Just wondering if anyone else has done something like this and what your results were...
 
I had 3 old (like 2011 old) packs of Wyeast in my fridge. West Yorkshire, Ringwood and London 1028.
 
Instead of throwing them out or starting each one individually, I put all of them together (without the smack pack wort- just the yeast) into a 400ml OG 1.035 starter and put it on a stir plate. This was just yesterday afternoon. If it looks like it has some growth, I'll step it up to a 1.5L starter.
 
Planning to make a dark mild with this when it looks like there is a decent volume of yeast.
 
Thoughts?
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Offline klickitat jim

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Re: combining old yeasts
« Reply #1 on: October 18, 2013, 01:26:29 PM »
I'd think they are toast now but you could give it a shot.

Online morticaixavier

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Re: combining old yeasts
« Reply #2 on: October 18, 2013, 01:27:02 PM »
should be fine. if the starter is active and you see growth. hard to say just how many cells you have but if you are doing a pretty low gravity brew it'll likely be fine.
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Offline a10t2

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Re: combining old yeasts
« Reply #3 on: October 18, 2013, 03:20:52 PM »
It'll be interesting to see what happens. I suspect that at this your viable cell counts are so low one strain will end up dominating.
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Offline jamminbrew

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Re: combining old yeasts
« Reply #4 on: October 18, 2013, 03:48:55 PM »
It'll be interesting to see what happens. I suspect that at this your viable cell counts are so low one strain will end up dominating.
A yeasty version of russian roullette?
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Offline klickitat jim

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Re: combining old yeasts
« Reply #5 on: October 18, 2013, 03:59:14 PM »
My money is on a super slow start that ends up being non of the above, and more wild that anything else. But I will proudly admit schoolage if I'm wrong

Online HoosierBrew

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Re: combining old yeasts
« Reply #6 on: October 18, 2013, 04:03:25 PM »
It'll be interesting to see what happens. I suspect that at this your viable cell counts are so low one strain will end up dominating.
A yeasty version of russian roullette?

Yep. I'd rather just buy new.
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Offline corkybstewart

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Re: combining old yeasts
« Reply #7 on: October 19, 2013, 07:15:56 AM »
It'll work.  Back in my poorer years I used to get the free vials of expired White Labs from a homebrew store.  Some would be 2 years old or older but still kept in the fridge(poor inventory management). I made starters with them and brewed great beer, but it took planning and a couple of weeks to build the starters.  Then they worked like any othervial of yeast.
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Offline reverseapachemaster

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Re: combining old yeasts
« Reply #8 on: October 20, 2013, 08:53:40 AM »
As long as you give yourself time to build up a sufficient yeast volume you will be fine.
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Offline surfin_mikeg

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Re: combining old yeasts
« Reply #9 on: October 20, 2013, 07:59:41 PM »
I've done this and have had it not turn out well.  I suggest tasting before pitching.  Its easier to simply buy fresh yeast.