Last weekend, I harvested the yeast (Wyeast Neobritannica) from a batch of beer and ended up with three one-pint mason jars with about .5 inch of yeast at the bottom. I checked on them yesterday only to discover that one of the jars started to freeze. The water at the top froze but the ice didn’t quite get to the bottom where the yeast is. There’s about an inch of (very cold) water between the yeast and the ice on top.
I moved the jar to a less-cold part of the fridge and am slowly thawing the ice. I still have two jars of yeast that didn’t freeze so it’s no great loss if this one is lost. But I’m a cheapskate and hate to throw out good yeast. Is it possible that the yeast is OK?