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-   -   Yeast Shelf Life (http://www.homebrewtalk.com/f163/yeast-shelf-life-163510/)

Cold_Steel 02-17-2010 04:27 PM

Yeast Shelf Life
4 months ago I saved a lot of yeast from a big brew I did. Over the months it has changed color. I have kept the yeast in the fridge the entire time.
It first was a creamy color on top then turned a brown color.
watch think trash? or yeast nutrient during the next boil?

BuzzCraft 02-17-2010 04:32 PM

I've reused yeast that old (and older), including the color change, with no problems....with a starter, of course. I'd use it.

Cold_Steel 02-17-2010 04:39 PM

REALLY!? Now mine has sediment at the bottom as well and liquid in too. What ration do you use for the starter?

BuzzCraft 02-17-2010 04:57 PM

Without getting too scientific about it (which you can't, cause you don't know your cell counts/concentration or viability of your yeast), just make up 1.5 L of 1.040 wort and you'll be fine. This is assuming you're making the average 1.050-1.065ish beer.

Decant most of the liquid off before you pitch into the starter wort....but leave enough to allow you to swirl the yeast cake into a slurry, so you can pour it out of the jar.

Someone else may chime in with another approach, but this has worked for me.

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