Thats good new ! I will definately use it !
Check the pitching rate calculator on MrMalty.com
If the yeast was produced on 7/21 then it is only 12% viable today. If you pitch only that nearly expired vial into your 5 gallon batch of beer your gonna have problems.
You need to grow a larger sample of yeast. You have 2 choices, one popular and one for people with limited brewing skills. People with my limited brewing skills buy new yeast and then use the fresh yeast to make a starter.
If yeast can be grown from a tiny amount that has been encased in amber for 45 million years, 45 million year old yeast ferments amber ale we really don't need to sweat too much about yeast viability....
we just need to think in terms of making starters.
In other words, you'll be fine.
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