The miracle that is Duvel yeast.

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luckyeddie

Landlord.
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A couple of weeks ago, for just my third AG, I got a bit above my station and turned my hand to making a Belgian Golden Strong Ale (instead of my usual practice of just drinking one or two). The WLP550 had been chuckling away in a carboy for about 10 days, and by carefully doubling up with 1040 wort every couple of days, I had about 3 litres of starter.

At the same time, I washed out the dregs of two bottles of Duvel and grew that on.

I cracked out 20 litres of 1075 OG and split it into 2 FVs. Into one half I pitched half of the WLP550 starter, and into the other one I pitched the Duvel starter. Fermentation was pretty rapid with both brews, but the FVs were in the lounge and it gets pretty cold at night. I kept swapping my (only) brewbelt over daily, but after 3 or 4 days I was fearing the worst because both fermentations had slowed to a crawl and so I ordered some Belgian dried yeast.

I decided to leave the brews alone, and actually gave them a full fortnight before cracking the seals tonight and taking SG readings. I was expecting stuck fermentations around 1030, and was resigned to either dumping or (if not spoiled) pitching the Safbrew Belgian yeast.

Imagine my surprise when the WLP550 turned out spot on at the predicted 1014 - and blow me down, the Duvel one (which I reckon was SERIOUSLY underpitched) was a creditable 1015 and is still fermenting slowly. As for the taste - well, I can honestly say that both (100 ccs of each headed down the gullet) are quite possibly the best two beers I have EVER churned out in 30 years of kits - and both Mrs LE and I actually prefer the Duvel yeast one.

A miracle worthy of the Trappist Monks themselves.
 
luckyeddie said:
- and blow me down, the Duvel one (which I reckon was SERIOUSLY underpitched) was a creditable 1015 and is still fermenting slowly.
Yes it does work LE, even after freezing them.
I've produced 38 such cultures to date, frozen them, and not one has yet failed!
The oldest being 16.2 months in the freezer.
 
evanvine said:
Kyral210 said:
How do you produce them?
Aleman disagrees with what I do, so when I get a moment, I will PM you with my method.
The choice is then yours!
It's not just me ;) A lot of distinguished yeast biologists have published methods to do it . . .including those that run big yeast farms

Don't hide it away Jim, I've never managed to freeze yeast successfully, and if you have a method that works, then post it here . . . I may very well post the 'best practice' method alongside it to allow people to compare
 
Aleman said:
Don't hide it away Jim, I've never managed to freeze yeast successfully, and if you have a method that works, then post it here . . . I may very well post the 'best practice' method alongside it to allow people to compare
Ok Tony, will do!
Give me a bit of time as I go through several stages (perhaps unnecessarily) which will take a bit of writing. :D
 
evanvine said:
Aleman said:
Don't hide it away Jim, I've never managed to freeze yeast successfully, and if you have a method that works, then post it here . . . I may very well post the 'best practice' method alongside it to allow people to compare
Ok Tony, will do!
Give me a bit of time as I go through several stages (perhaps unnecessarily) which will take a bit of writing. :D


I'm looking forward to that post :thumb:
 
Me too. I have got loads of different yeast cultures now and they are beginning to fill up my fridge - there soon won't be room for my hops. I end up bottling the yeast cultures in Grolsch swing-top bottles.

Incidentally, I bottled the Belgian beer from the WLP550 tonight - I siphoned into my bottling vat, added 60g of candi sugar and 4 teaspoonsful of the yeast slurry from the primary. The rest of the slurry I washed into a 5 litre carboy with a litre of 1040 wort - I'm having another brewday on Sunday and am going to make a 'sipping' Belgian like Chimay Red so I thought that would do as a starter.

Evidently I overdid it. It kicked off inside 20 minutes, and 10 minutes later, was blowing foam through the airlock. It filled 4 litres of headspace in 10 minutes - awesome. It's in cold water with a tinfoil lid on it now. If Belgium want to ever put a man into space, they just need to power the rocket with wort and Orval monastery yeast (that's the source for WLP550, I believe). Sit down and hold tight.
 
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