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Starting yeast from bottle

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Prepare some sterile water (boil and cool), add 1 teaspoon brewing sugar to half a pint, open bottle, pour out beer, add sugar solution, plug neck by stretching over a new poly bag and securing with rubber band, swirl, place in a warm place, drink the beer, after 24 hours swirl again, if poly seal "inflates", you have succeeded. But beware, some makers add a different yeast to prime the bottles.
 
+1 to what Bob said. If that's not possible though, or you have something you could look through to see the color of the yeast use that instead of the (amber) bottle. That way you can see the layers of yeast and can determine it's viability by what color the yeast is. (Creamy white is viabile, brown yeast is dead or trub.)

Allagash uses the same yeast to bottle condition their beers as it does to ferment them. That was from the mouth of Rob Tod on the 5-17-09 Sunday Session on the Brewing Network. But, again, Bob is right. Some breweries do use a clean fermenting lager yeast to bottle condition their beers.

To make sure that you are getting the tastes you want from the yeast, or have the exact same yeast that the brewery used, you'll need to make a small test batch.
 
I want to do the same with a large Ommegang bottle. Is the yeast within a good one to try to harvest?

Thanks,

Sheldon
 
Yes it is. I went on the tour and they gave me two great bits of info about their yeast:

1) They only use one strain for all of their beers

2) They use that same strain to bottle condition

and for extra credit

3) They suggest to harvest from their WIT as it is the lowest ABV so the yeast will have been stressed the least and give you the most healthy colony.

Good luck!
 
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