On Sat, 31 Mar 2007 11:12:45 -0400, <abe865fdecdefg235726816@abe865fdecdefg235726816.com> wrote:[color=blue]
> If I use dried yeast from one of those hermetically sealed foil packets but
> don't use the entire packet, can that yeast be stored and used later?[/color]

Why not use the whole packet?
[color=blue]
> How should it be stored? Refrigerator? Freezer?[/color]

I store unopened packets in the fridge. I guess you could store a
partially used one the same way. Try to close it back up (or put it in
a ziplock bag, etc) and put it in the fridge.
[color=blue]
> What might be effects on my fermented product be if the opened yeast packet
> is stored too long?[/color]

If you store them too long the viability goes way down (the yeast starts to
die) and you can have problems with the fermentation. IMO, using a partial
packet isn't a good idea anyway unless you're making really small batches.
A partial packet is already going to be under pitching before you take
into account any viability issues. The standard packet size is around
10 grams, and is designed for a 5 gallon batch. Even if you're doing
something like 3 gallon batches, I'd still use the whole packet. Dry yeast
is so cheap that trying to split a single packet up doesn't seem worth the
trouble.


John.