The bar fridge over crashed my starter into a solid chunk. Are they all dead or should I decant and add more wort?
Thanks.
Chris White from White Labs has indicated that frozen vials will lose 10% viability. So I would reckon that you probably also lost 10% or so with the freezing that occurred. If it were me, I would allow it to warm up to room temps, decant and pitch some fresh wort on top just to be sure they are still viable and alive.
Just to follow up, I decanted and added another batch of starter wort and it took off quickly so I am going to assume viability was pretty good. Can’t say for sure what the exact percentage would be but I’m happy with the results and wanted to follow up to confirm that the yeast was not killed by the freezing.
Good on ya, Graham!