Just wanted to be sure.
https://www.homebrewtalk.com/f13/guide-making-frozen-yeast-bank-35891/
"Second, a bit of glycerine, also known as glycerol (but NOT glycol!!) helps prevent freeze damage. I buy glycerine from my LHBS or pharmacy. Just be sure to get the type that is safe to ingest (it is harmless at these quantities)"
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