out of date yeast

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out of date yeast

Postby HTH1975 » Mon Aug 29, 2016 17:30

I'm sure this subject has come up before, but I used some Wilkos Gervin yeast that went out of date Feb 2016. Rehydrated and pitched last night and it's went off like a rocket when I've come home from work tonight.

Just goes to show, it's worth a shot even when it's out of date. I had a similar experience with some Whitelabs Kölsch yeast that was out of date and was a very strong fermenter.

2016: 330L brewed (72 gallons, over 8 firkins)
2017: 105L brewed (need to update this figure)
Drinking: Landlord clone
Conditioning: ciders from 2016, hedgerow barrolo, 1914 Courage RIS (10%).
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Re: out of date yeast

Postby Pakman » Mon Aug 29, 2016 17:34

I always buy short dated Gervin from Wilco's and previously Lakeland as they always reduce the price heavily to shift old stock. Never had a failure and have used up to 1 year ood.
Graham

If they say money cannot buy happiness - then explain motorcycles and beer! :thumb:
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Re: out of date yeast

Postby robwalker » Mon Aug 29, 2016 19:00

Yeast isn't really an on off switch, you may get an active ferment but the less viability you have, the less healthy the ferment is likely to be and may cause any number of problems. Fresh commercial 500g packs of Nottingham are already only around 70% viable, yeah your beer is probably fine but always aim to pitch enough healthy cells to do to job start to finish at maximum capability.
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Re: out of date yeast

Postby HTH1975 » Mon Aug 29, 2016 19:59

I hear what you're saying - I should have mentioned that I pitched a full packet of yeast in 5L of wort (a mini-batch to test out a honey beer recipe). I reckon there will be enough viable yeast for that amount of wort, even with it being out of date.

2016: 330L brewed (72 gallons, over 8 firkins)
2017: 105L brewed (need to update this figure)
Drinking: Landlord clone
Conditioning: ciders from 2016, hedgerow barrolo, 1914 Courage RIS (10%).
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HTH1975
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Joined: Sun Jan 24, 2016 19:16
Location: Thirsk, North Yorkshire

Re: out of date yeast

Postby PhatFil » Wed Aug 31, 2016 06:11

afaik dried sealed yeast packs dont really have an expiry date and only have one stamped on the pack due to them being a foodstuff. ive used yeast 12months+ after the date stamped on a pack..
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Re: out of date yeast

Postby HTH1975 » Wed Aug 31, 2016 07:24

PhatFil wrote:afaik dried sealed yeast packs dont really have an expiry date and only have one stamped on the pack due to them being a foodstuff. ive used yeast 12months+ after the date stamped on a pack..


That's good to hear. Would be interesting to do a cell count on an out of date pack of yeast versus a fresh in-date pack to compare viability.

2016: 330L brewed (72 gallons, over 8 firkins)
2017: 105L brewed (need to update this figure)
Drinking: Landlord clone
Conditioning: ciders from 2016, hedgerow barrolo, 1914 Courage RIS (10%).
User avatar
HTH1975
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Posts: 1132
Joined: Sun Jan 24, 2016 19:16
Location: Thirsk, North Yorkshire


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