Active or instant? Both can get less potent after a couple of months.
The dried active stuff.
I just checked the dates on it - July 2017 is possibly a bit old, I admit.
Ah well - another week and my latest starter will be good to go*
* i.e. forget about / ignore, and allow to turn into prison hooch.
I got some from 2013! I think you need to give it some sugar and warm water to get it going. It's rising now, but much more slowly than usual
@NotThamesWater started
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Active or instant? Both can get less potent after a couple of months.